... clutch bearing, etc.3 retainer: cooper, nylon, bakelite, stainless.4 quality:ISO90005 delivery: great stock and ready goods6 Bore diameter: 1mm ... . Material: GCr15, SiMn etc8 feature: low noise, long life ,high precision,9 apply: machine tools, electrical ,railways,automotive,construction machinery ... box+carton+pallet.(according to your requirement ) YNN Brand high quality Automotive wheel bearing