Purpose: Used to fix the sprocket when disassembling and assembling the bicycle cassette flywheel. Supports flywheels with the first sprocket of 11T or 12T. (If it is used for a flywheel with the smallest sprocket of 10T, please position the wrench on the second small sprocket, which is generally 11T or 12T) As long as the flywheel has 11 or 12 teeth, it can support. robust in shape & heavy duty; Made of High Quality Meterial, Stronger And More , Improve The Appearance Easy to use,Easy to replace Color: Black & Silver Material: Stainless Steel Package Contents: 1 * Bike Flywheel Cassette 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 the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.