Stainless Steel 5mm Deep U Groove Ball Bearings Pack of 2, Pulley Bearing Wheel Rail Ball Bearings Wheel

Dislike fact soap was not included

Excellent product ! They are very smooth with very little slack in any direction

Great

One of the bearings on our backyard zipline had froze up with rust over the years and this replaced it perfectly. Zipline is working great again. Just make sure the measurements match what you need.

These salvaged our zip line, which has been neglected by the kids because it no longer zipped. The new bearings where a perfect fit, and the zip line works perfectly now.

Center bore is 1/16 smaller that the 1/4 that is states. True measurement is 3/16.

I used these on a farmhouse door build. The ball bearings made the doors slide effortlessly and the V-groove on the pulleys kept the pulley centered on the rail.

Bought these to replace one I had that wore down. These worked great so far. The kids have only used the zip line a few times since Ive replaced it with these so time will tell us on the longevity.

These are the best I can find. I wish they were cheaper but quality sometimes costs.

The bearing I just received (S608z) seems to be of nice quality (maybe a 4 or a 5). Seems tight and good finish. But the dimensions listed arent close to actual. The bearings I just received had an outside diameter of 31.5mm, and a width on outside of shoulders of 12mm (10.43mm for width of rotating pulley). The shaft appears to be closer to .25 (6.4mm). And depth of groove is 2.8mm. Maybe size doesnt matter (no joke intended), but not sure why you would put dimensions in a listing if they arent right.