... roller bearing, spherical roller bearing ,thrust cylindrical roller bearing, thrust needle roller bearing, thrust tapered roller bearing, spherical thrust roller bearing, clutch bearing, etc.3 retainer: cooper, nylon, bakelite, stainless.4 quality ... . Material: GCr15, SiMn etc8 feature: low noise, long life ,high precision,9 apply: machine tools, electrical ,railways,automotive,construction machinery ...