A must for assembling vertically split crankcases. Safely and easily pulls crank assembly into crankcase. Heavy duty steel construction. Includes female m10x1.25mm and m12x1.25mm adaptors to attach to crank assembly. Will not work on cranks that use a snap ring to hold the primary gear on (common on several Kawasaki models). The crank must have 10 or 12mm threads. Please note this will not fit the Raptor 660.