Feature: 1. REMOVAL TOOL: Easily maintain your coupling or remove the flywheel nut with this versatile piston stop tool. This is a general piston stop that requires the crankshaft to be held in place. 2. SCOPE OF APPLICATION: Perfect for repairing brush feeders, leaf blowers. Can be used to maintain the coupling or remove the flywheel nut, or to repair brush feeders and leaf blowers. 3. HIGH EFFICIENCY: Machined with a full radius to avoid damaging the piston top, this tool is both efficient and easy to use.The end is machined with a full radius to avoid damaging the piston top. 4. EASY TO REMOVE: Simply remove the spark plug, screw the tool on, and tighten gently for hassle free removal. Remove the spark plug, screw the tool into place and press lightly on it. 5. EASY TO OPERATE: Turn the motor clockwise or counterclockwise until the piston is ready to be repaired. until it appears that the piston is conflicting with the tool and is ready to be repaired. Note that most chainsaws have left hand threads on the coupling side. Specification: Item Type: Piston Stop Flywheel Disassembly Part Material: Iron Weight: Approx. 314g / 11.1oz Suitable For: Electric Saws, Chain Saws, And Petrol Saws Inner Diameter: 45mm / 1.8in Hole Diameter: 8mm / 0.3in Outer Diameter: 55mm / 2.2in. Package List: 1 x Instruction Manual1 x Chainsaw Coupling Removal Tool1 x Piston Stopper