Commonly called the "fourth hand," the Park Tool BT-2 cable puller is a great help when installing and adjusting bicycle derailleur and brake cables. With one hand, the BT-2 grips and holds the cable in place, pulling it taut, allowing you to set the perfect tension and tighten the clamping bolt. The convenient ratcheting thumb lock keeps the cable tension in place. Made from heat-treated chrome-plated steel, the BT-2 is built to last a lifetime, with padded grips for comfort. A must-have for any shop, home, or professional workshop.