Check the listing for details. Performance Engine Piston Ring Filer Grinder Grinding Tool Aluminum Alloy 66785. Condition: New. Listed at 19.85 USD. Performance Engine Piston Ring Filer Grinder Grinding Tool Aluminum Alloy 66785 Description: Condition: 100% Brand New & High Quality Type: Piston Ring Filer Tool Material: Aluminum Alloy Power Source: None Style: Manual Operated Model Replace Part Number: 66785 Number of Grinding Wheels Included: 2 The piston ring filer grinder is made from high-quality aluminum alloy, and it is durable and long - lasting to use. To assure proper piston ring end-gap, the piston ring filer enables the user to file piston rings quickly and accurately. 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