Part of a comprehensive range of freewheel and bottom bracket 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 high strength tool steel fits 12 tooth internally splined record chorus and athena cartridge bottom brackets and campagnolo cassette hub lockrings compatible with 11 speed lo