Top and shank mounted road bit bearings. Use the bearings to repair your road bits. Create a groove of different depths or widths in the board. Contains bearings, set screws and hex keys. Made of high quality steel, and easy to use. Suitable for milling heads and shank. Color: black + silver Material: steel Size: inner diameter: 4.76mm outer diameter: 12.7mm Package Contents: 25 * Bearings 25 * Screws 5 * Wrench Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing thing. The measurement allowed error is +/- 1-3 cm.