Historically, a claw cocking lever was primarily made of iron or steel to withstand the enormous forces involved in cocking a crossbow. Unlike the rack and pinion cocking lever, which uses a crank and gears to move heavy loads linearly along a toothed rod, the claw cocking lever utilizes a simple lever principle: it is hooked onto bolts on the crossbow's stock, allowing muscle power to pull the string into the nut via leverage. While the rack and pinion cocking lever is designed for very heavy loads and precise lifting, the claw cocking lever serves as a compact, purely manual cocking tool for medium-weight crossbows.