... G100 to G1000 2.high precision 3.Hardness:HRC58-62 1/4 ,G20 chrome bearing steel ballschrome bearing steel ball1)material:AISI52100 ... GCr152)Size:1/8",1/4",3/16",5/16",5/32",3/8"3 ... : Good wearing, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & ...