... .could be used in bicycle,bearings ball retainers for bicycle parts,bearing cages,copper,nickle plated 1/4*9 1/*85/32* ... hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & micro – ball for the electronics industry. 2. High ... High - speed, low noise special bearing 4. Ball valves for liquid and gas ect 4.Enjoy more of the steel ball product images ...