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Description
Venev Ursa Series Dual Side DiamondVenev Ursa Series Dual Side Diamonds Compact 16 mm dual sided resin bonded diamond stones for Hapstone guided sharpeners and freehand sharpening. Format 16 mm wide profile Ursa Series is a narrow dual sided diamond stone designed for Hapstone guided sharpeners and compact freehand use. Construction Two diamond layers Each stone has two 1 mm thick diamond bearing layers on an aluminum plate with evenly distributed diamond grains. Performance Bonded
Venev Ursa Series Dual Side Diamonds
Compact 16 mm dual-sided resin bonded diamond stones for Hapstone guided sharpeners and freehand sharpening.
Format
16 mm wide profile
Ursa Series is a narrow dual-sided diamond stone designed for Hapstone guided sharpeners and compact freehand use.
Construction
Two diamond layers
Each stone has two 1 mm-thick diamond-bearing layers on an aluminum plate with evenly distributed diamond grains.
Performance
Bonded diamond feedback
Bonded diamonds provide better sharpening feedback and give the stone a much longer lifespan compared to coated diamonds.
Combinations
F80+ F150
F100+ F240
F240+ F400 OCB
F400 OCB+ F800 OCB
F800 OCB+ F1200 OCB
Grit system
FEPA-F classification
All Venev diamonds use FEPA-F grit classification. Ursa Series is available in five grit combinations.
F80 to F240 utilize the legacy binder, while F400 to F1200 utilize the OCB binder.
The OCB version uses a yellow binder with no abrasive particles in the composition. OCB is available in fine grits only and offers better scratch-free sharpening results.
Use and maintenance
Water recommended for best feedback
Venev Diamonds are recommended to be used with water as a lubricant for the best sharpening feedback. The diamond layer does not absorb water, so it is enough to splash water on the stone surface.
Dry use is acceptable, although it results in faster wearing and speeds up stone loading.
Additional flattening and lapping can be performed to improve sharpening quality. Loose silicon carbide powder is recommended. Diamond lapping plates are not recommended.
Specifications
Stone size6” × 1/2” × 3/8” (150 × 16 × 10 mm)
Weight3.2 oz (90 g)
MaterialAluminum
AbrasiveDiamond
BinderResin OCB
Concentration100%
FlatnessUp to 0.2 mm
Working withWater, oil
Stone typeDouble-sided stone
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 147 reviews
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Product Reviews
★★★★★ 5
The best little helper!
Size: eufy L60 SES (renewed)
I've never owned a robot vacuum prior to this, and was somewhat curious on how it would work, and what it would really do in my small home. I got the L60 refurbished unit, and it came in a brand new box and it looked brand new when I removed it from the packaging. I charged it up, setup the app and connected it to Wi-Fi, ran a cycle and it was all so easy. It mapped my home and it is was off! It does an absolutely fantastic job. I run it daily and can notice just how much cleaner my hardwood floors are.
We have a cat who is intrigued by it, but it does a fantastic job of cleaning up the litter that is tracked from his litter box. That alone is a lifesaver. I will run it in the morning and at night in cats area to keep the hair and litter completely cleaned up.
So far I've only had a few small issues where it got stuck, twice from items left out, and once from a dirty sensor. You really need to make sure you have things put away and have the areas picked up, especially of cat toys and shoe laces, and once in a while wipe the sensors off if they get really dusty.
I highly recommend this, it truly has been a huge help just in daily pickup and keeping the house clean. Its absolutely worth the money.
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Reviewed in the United States on February 25, 2026
★★★★★ 5
Changed my life!!!
Size: C20
Detailed review below if you want to read it. If you just want a quick summary: It changed my life, it’s worth every penny, just buy it! I don’t normally spend this much money on anything but, for me, it has been 💯 worth it! It does take some time to get it set up and get the settings that work for your needs and house but is worth it a thousand times over. Handles a massive amount of dog hair like a pro. Does good on all surfaces except cheap bath mats, you’ll have to pick those up. There is maintenance but it is not difficult or time consuming. App works well and issues are easily to troubleshoot. Anytime maintenance needs to be done, the app sent you a message and a video on how to do it.
Detailed review:
I’ve had this vacuum/mop for 6 weeks. I don’t normally do reviews but I’ve been telling everyone I know how this bad boy changed my life! Important to note I’m also cheap as H@ll! I don’t have much to compare it to in terms of how it measures up to the competition. I have a 10 year old first generation Eufy vacuum named BB8 that will fall down the stairs and suck up the dogs tail if not supervised so that’s my baseline.
I have two 80lb Labs, two feral kids, a blue collar husband and OCD (like the kind you take medication for and left unchecked does permanent psychological damage to children). We moved from an 800 sqft house to a 3,000sqft house and by the time I was done cleaning the floors at one end of the house my family had already destroyed the other end. Keeping the floors clean and dealing with the dog hair tumble weeds was a full time job. My family had to be punking me with hidden bags of dirt and dog hair or something. I was losing my mind, literally! I spent the last 20 years saving for my dream house and the floors looked like a trap house no matter what I did! I thought our floors at our old house were bad because we had so many people in a small space. Turns out my family is just gross.
In terms of this robot, who my kids have loving named Consuela, after the house keeper from Family Guy. (It is important to name them, they work better when they have names😅.) You don’t have to worry about her becoming self aware and taking you prisoner Terminator style as she is not super smart. She doesn’t always know what she is doing but she works hard at it! The first week of training was a little rough but now that Consuela and I have a system it’s a complete game changer. Comes right out of the box and set up is a breeze. I had a little trouble with the app because I already had Eufy everywhere in my house. I downloaded the Eufy cleaning app which made my Eufy home security app stop working. Eventually, I got everything on the same app and it works seamlessly (this was probably my own fault as I didn’t read the instructions bc I like to do things the hard way). Out of the box she has to map out your house. I found this was the most important step. The first time I had her map my house I didn’t move or pick up anything. The map sucked and it was a disaster. I redid the mapping step and literally picked up everything not nailed down, chairs small end tables, trash can, pots, etc. and kept the dogs downstairs. After I did this the map was absolutely perfect (a good base map is key). You don’t have to move everything when she cleans, just the first time to get a good map. My main level is one massive open concept (probably 1,000sft and Consuela identified it as one room), then 2 bathrooms and three other bed rooms. At first I tried telling her to clean the entire main level as it is one of the options. That did not go well. I feel like she might have a little adhd. I ended up taking the time to set up “Zone cleaning” scenarios and saved them on the app. Zone cleaning is the way to go with big open areas. I broke the great room into 3 sections. We have Apple home we linked to it so now we just say, “Siri, tell Consuela to clean the kitchen, living room, bathrooms, etc.” We played with the cleaning setting and found what worked for us. I have her programmed to clean different zones at different times a day. With my feral family we have to run max vacuum suction and two passes with heavy mopping so the battery drains fast. If your children were not born in a barn yard, you don’t run a wood shop and mowing business out of your garage and don’t have dogs who shed 12 lbs of hair per hour the normal settings would be fine and she could probably do our main level on one charge. With our workload she does two zones, takes a break to charge and then does two more. I have her programmed to clean each zone twice a day. I think for a normal family once every other day would be fine. My floors have never been so clean. NO dog hair anywhere! I’ve never lived in a house without dog hair. I did a deep cleaning of the floors throughout my house the day I got her and I have not had to vac or mopped since! I also think starting with clean floors is a key to success. This does not deep clean but if your start clean and run it often the floor stay spotless. With her running everyday nothing builds up in the corners, under beds and couches. It’s life changing (for me anyway)! We have laminate floors, carpet, tile and a few very thin rugs. She is amazing on the tile, carpet, and laminate but does struggle with the rugs. My rugs are super cheap, thin, and lightweight. She has lots of trouble with the bathroom rugs so we started hanging the bathroom mats after we shower which is actually better for us. Our large area rug is a bit of a struggle and hard to watch 🤣 but if I don’t watch her, eventually she moves on and it is clean. She has only gotten stuck on the rug once. So cheap rugs are a challenge but going from hard floor to carpet works perfectly! I do think she would do well with high quality heavy rugs. Like I said I have OCD so I keep a tidy house without much clutter. She does a good job avoiding objects, if the dog is napping she can “see” it and doesn’t suck up a tail like our other robot vac. It does an okay job avoiding cords but if it hits a phone charger on the floor just right it will suck it up. (Only happened once) My son left a shirt on the floor and it did end up sucking it up but it was an easy fix. All and all it does a good job avoiding dog toys and things on the floor but if she hits something at just the right angle she does get stuck but you just have to pull it out and hit restart. Consuela not going to clean up an entire bowl of cereal, a can of spaghettiOs or big spills. She would probably destroy the entire room. However, if my dogs leave a trail of muddy footprints she does do a good job spot cleaning stuff like that. She will keep clean floors clean indefinitely.
Maintenance: this is not a set it and forget it type of thing. There is maintenance that needs to be done regularly to keep her going but it is not hard. There is a tray that pops out that needs to be rinsed. If you don’t, it gets clogged and pauses the cleaning cycle. Even when this happens it’s an easy fix. It has a disposable bag for dust and dog hair. Ours fills up once a week, a normal family could probably get several weeks per bag. They are not terribly expensive but I do NOT replace the bags! I just dump them out into the trash can because I’m cheap. I’m still on my original bag. Water tanks: we mop at least twice per day with the high water setting and a full water tanks lasts two days. The mop pads are cheap. We bought several and I just wash them once per week and it takes two seconds to change them. I think they’re supposed to be disposable. The worst part, which is not the vacuums fault or a design flaw, just the nature of the beast. The dirty water tank! We can go on a tank of water for two days but if you leave dirty water in the tank for an extended period of time it reeks like rotten sewage🤢. It does NOT make your house smell at all. You can’t smell it until you open it. If you empty it every day it doesn’t smell but if you forget and go on vacation like we did it’s bad! I started putting a few drops of bleach in the dirty water tanks when I empty it and we have zero smell now (no idea if it’s okay so do at your own risk). The app is awesome. If there is an issue the app sends an alert and tells you what’s wrong. It also pops up a video telling exactly what to do to fix the issue. Yesterday it told me I needed to clean the sensors and showed me how to do it. I don’t like to spend money on things like this but I use it so much I almost wish I would have spent the money on the top of the line model. Although I don’t have any complaints with this one.
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Reviewed in the United States on August 23, 2025
★★★★★ 1
Junk. Save your time!
Size: C20, Size: C20
Okay, so I thought I did good research on this. I saved up for this purchase excited since we had just finished installing new floors through our entire house. As soon as the installers left, I broke out my new vacuum, downloaded the app, followed the instructions and did the required upgrade to the vacuum. Once it started to do it's first mapping route, the app immediately said network slow. The vacuum would pull out from the base about a foot and just spin, then return to the base and start drying the completelt unused mop heads.
I've tried taking it to my friends house and using another person's wifi, deleting the app and reseting the vacuum multiple times, tried repositioning a few feet from our router, tried running it through my ipad instead, everything including having comcast come out and check our network. Mind you, our TVs, alexa, ans any other devices in our house work just fine on our network. Eufy App would always say network slow and not even go further than a foot from the base. Obviously something is wrong with the vacuum, not my wifi.
Finally contacted customer support. First one in the chats brilliant solution was to try ro run the vacuum through Hotspot. Seemed ridiculous, but I tried. Once again, app said network slow. He then said he can't help me and that my chat log is being sent to their "engineering department". Waited 1-2 days for their "engineering department" to email me. They wanted proof of purchase, serial number, and a video of what's wrong with it. Submitted it and was told it'd be another 1-2 days while their "engineers" review my issue.
Woke up to an email this morning from their engineers and their suggestion after everything I've told them was to "try restarting it". Did they even read my messages of everything I've tried to do to be able to just use and keep my vacuum? Try hot spot and restarting it is their advice from their "engineering department" after days of waiting for a solution?
Returning this. Customer service is a joke if they ship you a faulty vacuum. Now I have to wait 30 days for a refund and then go buy a different brand. Waste of my time and left me disappointed over something I was excited about.
Update -
Eufy contacted me and offered a refund. Said to reply "Full refund" if i wanted one. I did. That was the day after the origjnal post, and they never responded or gave me a refund. Customer support sent me a replacement. Worked beautifully after I skipped the firmware update. It did an automatic software update yesterday, and it got stuck at 15%. When I woke up this morning, it's stuck at 13%. Once again our network is fine and stable, there's something wrong with their updates. Even customer service after doing their "analysis" of the returned original vacuum said that their "engineers" had diagnosed the problem as a hardware/software issue.
So, now I gotta box up another bulky item and return it. Hopefully by the new year I'm finally given a refund!
Save your time!
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Reviewed in the United States on November 21, 2024
★★★★★ 5
Efficient, Sleek, and Hands-Free Cleaning for Smaller Spaces
Size: C20, Size: C20
I live in an 800 sqft condo with mostly hardwood floors and a few small rugs, and the Eufy Omni C20 has proven to be a great fit for my space. Here’s a breakdown of my experience with the vacuum:
1. Ease of Use
The Omni C20 is incredibly easy to set up. After plugging it in and filling the water tank, I was good to go. The water tank is very user-friendly, with a convenient handle and a well-sealed cover that prevents leaks, which is a common issue with some competitor models. The ambient light under the water tank adds a cool visual touch, making the vacuum feel a bit more premium.
2. Lidar/Proximity Sensor Upgrade
The lidar and proximity sensors on this model are a major improvement over other robots I’ve used. Coming from the Eufy X8 and Dreame D10 Plus, both of which had solid lidar systems, I’ve noticed the Omni C20 maps my apartment much more efficiently. In my previous models, the first mapping session could take 20-30 minutes, and the robots didn’t always distinguish between walls and furniture. The Omni C20, however, only takes about 3 minutes to complete the initial mapping and does a 3D scan, accurately identifying solid walls from furniture like countertops. Very impressive!
3. Sleek Design and Low Profile
While the lidar sensor is much improved, what really stands out is the Omni C20’s sleek design. Unlike my previous robots, which had a visible sensor bump on top (think of the lidar sensors on autonomous cars like Waymo), the Omni C20 has a slim, almost Tesla-like profile. The entire body is only about 3 inches tall, allowing it to easily go under tight spaces like couches and cabinets. I’m not sure how Eufy managed to achieve this, but it’s a big plus for anyone with limited clearance.
4. Good Surface Detection and Nice Cleaning Performance with a small trade off
The C20 does a great job of differentiating between surfaces. It switches seamlessly between mopping and vacuuming when it detects a change in floor type, even when it comes to something as small as a door mat. Its cleaning performance is impressive, though it’s not the fastest robot out there. On average, it takes about 1 minute per 10 sqft for a combined mop-vacuum cleaning session. For comparison, my Dreame D10 does the job almost twice as fast. However, the C20 delivers superior cleaning results and even goes back to wash the mop during the cleaning cycle, which contributes to the longer duration but is a great feature. I’m happy with the trade-off since the C20 offers a more thorough clean.
5. Ok Battery Life and Long Charging
One of the few drawbacks I’ve noticed is the battery life. It’s not the best in its class. On average, the C20 uses about 60% of its battery to clean my entire 800 sqft apartment. By contrast, my Dreame D10 only uses about 30% for a similar cleaning. The C20 also has a slower charging time, taking over 3 hours to fully recharge. However, given its smaller profile and ability to clean tighter spaces, I’m okay with the trade-off.
6. Mop Drying Noise
Another small concern is that the robot produces a low, constant noise for a few hours while it dries the mop after cleaning. While it doesn’t use hot air drying like some competitors, it’s a more energy-efficient approach. This isn’t a major issue for me since it’s part of the self-sustaining, hands-free cleaning process. I’m happy to let it do its job and dry, charge, and clean itself without any intervention from me.
Conclusion
Overall, the Eufy Omni C20 offers a fantastic hands-free experience with impressive cleaning performance and thoughtful design. While it’s not the fastest in terms of cleaning time or battery life, the superior mapping, sleek profile, and thorough cleaning make it well worth the investment. If you have a smaller space, like a studio or a 1-3 bedroom condo, this is a great robot vacuum to consider. However, if you have a larger home and need longer battery life, you might want to explore other options, especially bigger ones. For me, it’s been a great fit, and I’m very happy with the results.
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Reviewed in the United States on November 28, 2024
★★★★★ 4
If you think you need a robot, you probably do
Size: C20
Bought this to clean up after my dad since he spills food on the floor multiple times a day. So my impressions so far, both good and bad:
#1 Fairly easy to set up, it makes you use an app of course, but the app is pretty nice. Mine wanted bluetooth and of course WiFi activated, but I think you can run it from your phone from another location without bluetooth.
#2 After setting it up in the dock and charging, I think it's best to let it map your whole house. I moved a bunch of stuff while it was mapping, but then I later wanted to add another room, so I had to have it map the whole house again. This wasn't really a problem since the robot maps a lot of areas pretty quickly. However, you can't edit maps in a way you might think you could, instead you just have to let it make a new map. The robot will latch onto power cords etc. while it is vacuuming/mapping the house for the first times. I'm impressed at how well the robot maps.
#3 The mopping is kind of mid-range with some really good and not so good elements so far. So the clean water and dirty water tanks are great. The 2 mop swirls are really good. The robot struggles a lot to get much mopping done because it wets/cleans the mop at the station, then takes the damp mop to mop a small spot, then has to return to clean the mops again. This is fine, but then the mop station stopped working and gives a cleaning tray error over and over. There seems to be no way to inspect the cleaning station in order to try to remove obstructions, I already checked the bottom tray, top containers, bottom of the robot, and looked for any way to access potential obstructions, so this may be the defeating flaw, but I will try a few more times.
Overall I really like the robot mop and I definitely want one that works well, so we'll see. First update: I watched a youtube video showing where the water suction tube is on the dock station, so that helped a lot to position the flexible tube so it will suck water up correctly.
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Reviewed in the United States on January 20, 2026
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