... Hardness:HRC58-62 3.could be used in bicycle,bearings 4.1/4" x 6/7/9/11 size ball retainers for bicycle ... retaining rings for shaftsbicycle steel ball retainer1.steel ball specification: 1)material:AISI 1006, AISI 1008, AISI 1010, AISI 10152 ... : wear-resisting, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & ...