Engine Piston Ring Filer Manual Operated Aluminum Natural ProformTo assure proper piston ring end gap, the piston ring filer enables the user to file piston rings quickly and accurately. Position the piston ring firmly against the dowel pins, crank the handle to turn the abrasive wheel. Using a feeler gauge, file the piston ring to meet the manufacturer specifications. Sold individually. Product Details: Engine Piston Ring Filer Manual Operated Model Comes with One 120 Grit Grinding Wheel Made From Quality Aluminum