... Hardness:HRC58-62 3.could be used in bicycle,bearings 4.1/4" x 6/7/9/11 size ball retainers for ... GB308-20026)Feature: wear-resisting, excellent surface quality and high hardness.7)Using:1. General industry for automobile, motorcycle, bicycle manufacturing, ... Yuncheng County, Heze, Shandong, China (Mainland) Brands:Ball King Number of Employees:101 - 500 People Company Website URL:http://lontencn.com