Granberg G1012XT PRECISION GRINDER (12V) Used for/with: Sharpening all saw chains Fits: Will hold all stone sizes for standard chain pitches and lowering depth gauges. 12-volt, 24,000 rpm motorized chain saw sharpener made of cast aluminum, molded poly carbonate and zinc-plated steel. Includes one each of 5/32in, 3/16in, and 7/32in stones to sharpen standard chain pitches Use description: Use calibrated swivel guide markings to set and hold correct sharpening angle. Integrated features allow users to set file height and tooth length.