FREEWHEEL/CASSETTE TOOL - For Shimano CS, SRAM, SunRace, Chris King compatible cassettes and Shimano Center Lock disc brakes. - Use with 1/2" Two-way Ratchet Wrench (#53R4) or 21mm spanner. - Product Dimensions: 4 x 2.5 x 2.5cm. - Weight: 0.048kg. - Colour: Black. - Material: Cr-V Steel.