Specification: Size(.): Piston Stop Plug Total Lenght: 60mm Piston Stop Plug Tread Diameter: 14mm Piston Stop Plug Hole Dia.: 8mm Clutch Expander Dia.: 45mm Clutch Expander Height: 35mm Fits for SX38 38cc SX45 45cc SX62 62cc and SX66 66cc Chainsaws Usage : Step 1. To use, remove the sprocket cover from your saw. . Then remove the spark plug and fit the piston stop plug in it's place. Step 3. , spin the clutch to rotate the engine so the piston is touching the piston stop. Step 4. Then place the demount tool on top of the clutch so the three prongs on the clutch demount tool slot in the corresponding holes of the clutch and the bottom of the demount tool fit neatly and evenly flat on the top of the clutch. Step 5. Finally, using a 19mm wrench and socket or spanner, spin the tool and clutch counter-clockwise to remove the clutch. Color: Orange & Black Material: metal Package Contents: 1 x Piston Stop Plug 1 x Clutch Expande Demount Tool Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.