625 Hybrid Ceramic Bearing 5*16*5 mm ABEC-1 ( 1 PC) Industry Motor Spindle 625HC Hybrids Si3N4 Ball Bearings 3NC 625RS 6305 hybrid ceramic bearing 25 62 17 mm abec 1 1 pc industry motor spindle 6305hc hybrids si3n4 ball bearings 3nc 6305rs