Axle type: Conical square tapered. Axle length: Available in 110mm, 113mm, 122mm. Axle material: Boron Steel Thread type: BSA. Shell: 68mm. Type BC 73A supplied with Aluminium cups Sealed cartridge bearings. Crank fixing bolts not included. (bolts are supplied with Dahon Chainsets) Good replacement for the basic unsealed axle and cups used on the entry level Dahons. Requires Shimano Spline tool to fit the unit.