The park tool fr 4 freewheel remover is made from heat treated alloy tool steel one inch base fits wrench or bench vise thin wall construction allows use without removal of cones and locknuts park tool fr 4 freewheel remover features part of a comprehensive range of freewheel removal tools 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 sr 1