Arrowmax Pinion Gear 64DP 38T (Superlight)Arrowmax moulded pinion gears. Using an anti slip golden anodised aluminium hub and high strength anti wear composites, the moulded lightweight design has been thoroughly track tested to ensure the pinions will withstand the rigors of both on road and off road stock racing. Using the gears will improve overall drivetrain efficiency, throttle feel and power. Uses M2. 5x2. 5mm grub screw and requires a 1. 3mm or 0. 050 hex driver.