Powerbuilt 648450 Piston Ring Groove Cleaner Made to be the most reliable tools in the market today Tool solutions for most all situations Built to exceed tool standards For removing carbon from piston ring grooves Adjustable for pistons 2-Inch to 5-Inch in diameter Will not come out of groove Cutter pressure is controlled for an even cut Includes 3 cutters with the following size blades: Cutter No. 1: 1/16-Inch, 3/16-Inch, 5/32-Inch, 1/8-Inch, 3/32-Inch Cutter No. 2: 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 1/4-Inch Cutter No. 3: 1.2mm, 1.5mm, 1.8mm, 2.8mm, 5mm, 5.5mm