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.Works on 5-speed to 12-speed mountain and road bike cassettes and freewheelHardened bolts hold securely and make chain replacement easyHeavy duty, heat treated headRound vinyl coated handleThe SR-2.3 is approximately 15" long (38cm)