Park Tool Sr-2.3, Sprocket Remover / Chain WhipInformation: This shop quality chain whip gives you incredible leverage without worry of slippage, and the head is uniquely shaped to allow quick and accurate access to any cassette or freewheel. Features: Works on 5 speed to 12 speed mountain and road bike cassettes and freewheel Hardened bolts hold securely and make chain replacement easy Heavy duty, heat treated head Round vinyl coated handle The SR 2. 3 is approximately 15" long (38cm)