CASSETTE LOCKRING TOOL - 5mm or 11mm guide pin to stabilize the tool for the through-axle hubs. - For Shimano CS, SRAM, SunRace, Chris King compatible cassettes and Shimano Center Lock disc brakes. - The guide pin prevents the tool from slipping out of the spline of the cassette lock ring. - Use with 1/2" Two-way Ratchet Wrench (#53R4) or 21mm spanner. - Product Dimensions: 7.5 x 2.5 x 2.5cm. ․ Weight: [5mm] 0.067kg / [11mm] 0.095kg. ․ Colour: [5mm] Black / [11mm] Black, Silver. . Material: Cr-V Steel.