... in bicycle,bearings 4.1/4" x 6/7/9/11 size ball retainers for bicycle parts,bearing cages, ... copper,nickle plated retaining rings for shaftsbicycle steel ball retainer1.steel ball specification: 1)material:AISI 1006, AISI 1008, ... wear-resisting, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings & micro – ...