Light and strong 2.5-pcs cranks made of heat-treated Cr-Mo 4130 steel with 19mm 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 (pressed into the right arm), Cr-Mo spindle bolt, 2 sprocket bolts (bigger one is hollow), assembly tool.