... used for bearings 2.Hardness:HRC58-61 3.High precision,ABEC-1,P0 3/16 inch ,4.763mm ball bearing steel balls,used for ... bearings ABEC-1,P0 high precision ,good quality ,fast delivery timechrome ... wearing, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & micro ...