Features:

2 sizes (8 pcs in total) of common ball bearing retainers for hub service. See the detailed size/quantity list in description
Made of high-quality carbon steel material.
Lubricated for corrosion resistance and long service life. Please still put some lubricant during installation to maximize its service life
These bearing cage could also replace loose bearings

Application Guide

3/16"X7 --- 4 pcs for front hub with 5/16 axle
1/4"X7 --- 4 pcs for front and rear hubs with 3/8 axle and Shimano CB Small "A" type