junk. Put them in an AO Smith single speed motor attached to a Hayward pool pump to replace noisy 8 year old motor bearings. The new bearings lasted 6 weeks until one got stuck. Another replaced bearing started to creak. I opened a fill on two other 10's that I bought from Revain at the same time. Lubrication was minimal. Also, the race was missing a ball bearing (there were only 7 in the race - there should have been 8). Great price for 10 packs. Low quality. I've ordered two Timken bearings and will be tearing the motor down again this weekend.