Heat treated alloy steel freewheel removers 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 frw 1 park tools or simply an adjustable wrench or bench vice fr 1c shimano uniglide fits shimano uniglide sun race and sachs aris freewheels fr 2c suntour 2 pin fits sun tour two notch freewheels fr 3c s