- Two-piece 6061-T6 aluminium crank arms with a hollow heat-treated chromoly crank spindle - Forged crank arms have a sleek shot-peened finish - Chromoly spindle comes in a 24mm diameter oversized and strong for the trails, featuring a standard size to fit the majority of bottom brackets - A SRAM Direct Mount 3-Bolt chainring interface, this ensures easy-fit installation - Included are two sets of bolts and spacers, gives the choice of running Boost 52mm or Standard 49mm - 675g for arms, axle, and hardware