The Lezyne Chain Drive Tool is tough. The forged steel body is CNC-machined to tight tolerances for accuracy. The body is contoured to feel comfortable in your hands. Lezyne even integrated two Mavic splined and two square spoke wrenches into the body for a little extra versatility. The breaker pin can be replaced in the unlikely event of a break, and Lezyne even had the foresight to include a spare just in case. The Lezyne Chain Drive Tool is compatible with nine or ten-speed chains and can be used for adjustment of wheels equipped with Mavic splined or standard square spoke nipples.