... —China.(AISI)52100—American,(Din)100Cr6—Germany.2) Shield/closure: open bearing, Z, ZZ, RS, 2RS.3) Vibration and Noise level ... level: ABEC1, ABEC3, ABEC5,ABEC7.5) Files usd in; Motocycle, Motor, Pump, Fan, Are conditioner, Microwave Oven, Rangehood, sewing machine, massage ...