2-pcs design cranks made of heat-treated Cr-Mo 4130 steel with 22mm spindle and 48 splines. RHD/LHD compatible. Two sprocket holes to fit all sprocket sizes. Small gusset to make the pedals assembly area stronger. Includes arms, spindle (welded to the right arm), 2 spindle bolts (alu 7075-T6 and Cr-Mo), 2 sprocket bolts (bigger one is hollow), and assembly/disassembly tool.