Park CT-5 Mini Chain Brute Chain Tool Park have produced a chain tool that is small enough to go anywhere, yet which performs like a full size workshop tool. Key Features Fine thread and slide-away T-handle gives plenty of pressure at the pin head to move stubborn chain rivets Includes a loosening shelf to release stiff links after assembly Replaceable driving pin head Works on most bicycle chains, including 10-speed Weighs just 77 grams