Park Tool SR-2.3 Sprocket Remover/Chain Whip. 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)