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Part Number: 66785 66786 are the replacing reference part number of the manual piston ring filer, please check before purchasing. Function: To ensure proper piston ring clearance, piston ring filer can be used to file piston rings faster and more accurately. Premium Material: Manual piston ring grinder is made of high quality aluminum alloy, will not rust, waterproof, solid and Easy to Use: Hold the piston ring on the pin and file the ring with a grinding wheel, shaking the handle to sure the piston ring clearance is correct. Practical Repairing Tool: Manual piston ring filer with 120 grit carbide grinding wheel is perfect for piston repairing.