... retainers for bicycle parts,bearing cages,copper,nickle plated 1/4*9 1/*85/32*20 retaining rings for shaftsbicycle steel ball ... retainer1.steel ball specification: 1)material:AISI 1006, AISI 1008, AISI 1010, AISI ... wear-resisting, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, special bearings ...