Check the listing for details. Performance Engine Piston Ring Filer 2*Grinder 66785 Grinding None Raw Aluminum. Condition: New. Listed at 20.86 USD. Product description: Type: Piston Ring Filer Tool Manufacturer Part Number: 66785 Material: Aluminum Alloy Made From Quality Aluminum and Has a Natural Finish 100% Brand new and high-quality made Color: Silver Style: Manual Operated Model Power Source: None How to Use: Give it a hard twist, rotate 180 degrees counterclockwise to make the handle outward, fix the piston ring on the pin, shake the handle and file the piston ring with grinding wheel to ensure the correct clearance of the piston ring. Note: When grinding the product, with the flat side of the piston ring facing down (must), manually turn the rocker to make it grind toward the inner side of the piston, because the grinding wheel will grind toward the outer side of the ring, which is not what you want, because it leaves burrs.Package included: 1x Manual Piston Ring Filer Tool 2x Grinding wheel