Aluminium Equipment Guide Bicycle Single Speed Road Part Axis Black : Mountain bike installation ring universal and support tool aid Made of aluminum, characterized by high hardness, can be used for long It is used for single disc sprockets, can work that will be smoother, driving experience Universal key size without key ; Support and crank should be removed when mounting the support function stabilizer Suitable for mountain bike use, it is the optimal size and is, the surface is smooth and burr-free - Inner mesh panties Material: aluminum alloy, nylon : black, red Size (dxsxw): . universal: 806025mm/3.15x2.36x1 inch Axis: 105 55 20 mm/4,13x2,17x0,79 inch universal use: stands 31,8-34.9mm/1.25-1.37 inch Axle application: threaded support BB, connected to the teeth of the disc 30-40T (press type is not currently present) contains: 1 2 piece installation tool