MaterialThe bottom bracket stripper is made of durable, high-strength steel that is rust and rot resistant, and has a hardened and heat-treated square hole spline bushing that can be used with a socket , a 24mm spanner or wrench. Portable The MTB center axle tool is small and portable, with a single weight of 112g and a single size of 5*2.9*2.9cm High PerformanceBicycle hub tools are specially designed for removing and installing DT and hub pawls. Necessary GadgetBike Crank Remover is a must-have gadget for repairing your bike and can be in the toolbox of any bike you own. NoteSpecial attention should be raised to the splined center shaft. If the center shaft length is more than 118mm, it will not be used. Since the diameter of the splined center shaft is relatively large, it will be blocked by the steps of the sleeve tool. If the square hole is good, it can be used for any size over 130mm.