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 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)