... deep groove ball bearing, angular contact ball bearing, four point contact ball bearing , self-aligning ball bearing, thrust ball bearing, cylindrical ... etc.3 retainer: cooper, nylon, bakelite, stainless.4 quality:ISO90005 delivery: great stock and ready goods6 Bore diameter: ... GCr15, SiMn etc8 feature: low noise, long life ,high precision,9 apply: machine tools, electrical ,railways,automotive, ...