Part of a comprehensive range of freewheel removal tools updated from the original fr 1 with deeper splines to fit 9 speed screw on freewheels oversized centre hole and thin wall design allows use without removal of cones and locknuts investment cast and heat treated for strength and durability one inch base fits end of park sr chain whips frw 1 wrench or av 5 vice jaws fits shimano uniglide sun race and sachs aris freewheels made in the usa and covered by parks legendary limited lifetime w