... used in bicycle,bearings 4.1/4" x 6/7/9/11 size ball retainers for bicycle parts, ... 1006, AISI 1008, AISI 1010, AISI 10152)Size:0.5mm-50.8mm3)Grade:G100-G20004)Hardness: Hrc58-- ... Feature: wear-resisting, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle ... 4. Ball valves for liquid and gas ect 7/32" Series steel ball retainer with chrome steel ...