20pcs V Deep Groove Ball Bearings Pulley, Mini Bearings Deep V Groove Guide Pulley Rail Ball Bearings Wheel for Micro Pulley Systems,4x13x6mm

If you know what you're doing, these are great pulleys! Yes, the bearing cover does come off easily but it's a non issue if you design your axle to account for it. Used these to build a physics force table for my children. 3d printed support brackets and axle and voila! $30 dollar force table compared to $100 plus if you buy a premade table! Great pulleys! With so many, you can use it for all kinds of pulley applications.

These were exactly what I expected. I ended up not being able to use them for the application I had planned on due to their size being a little smaller than I needed, but I had no problem finding another use.

For the price, I am impressed by the quality of the bearings and consistency of the manufacture.

I purchased these bearings to use on a travel ukulele I built to carry in my suitcase on trips. The bearing were used as rollers to support the strings. They worked just as planned and allowed me to build a unique instrument.

Made of very soft steel. Most were packaged in small tubes & arrived un damaged. However a few were put in loose (4 ea). Those 4 beat the hell out of one another in shipment & arrived all very badly dinged up to the point they are not useable. As I said.. these are made of very soft steel. My intended use is to construct a coiled brake line tube straightener. For this project.. I hope they last long enough to get the job done on my pickup truck. They are also much smaller than I though they would be.. my fault I guess for not using my calipers to demonstrate the size before ordering. If you have a need for very cheap small bearings for a short term project that does not require hard steel bearings.. these may work for you.

Plan to use it on my table jigsaw diy. Just havent had the chance to add it.

These bearings work fine for my small wire (.029") straightener. Shipping time was reasonable and the price is great. @ $0.40 each these are cheap and useful.

Excellent pulleys. I've not installed them yet. If they don't work after my installation, I'll update. But looking at them, I'm confident they will work fine. They are exactly as described and shown in the picture

alles gut

Simply perfect. Works everytime, and totallly worth the money

I like the groove. It is not what i expected, i thought they would play some sort of groove music as they rolled around but the groove is actually an indentation in the outer shell to keep something in place like a wire. They are cool though. They will take weeks to arrive from China but rest assured, they are well lubricated!

good product for the money

Those are super small and low quality. Out of the bag they're sticky and don't roll all that well. Many of them are missing a 'cover plate' and you can see the balls inside the bearing. They'll pick up dust and get destroyed in no time...