CTA Tools 2300 Engine Cylinder Hone - 32 to 89-Millimeters Resurface Cylinder Walls so New Rings will Seat Eliminates Minor Cylinder Wall Imperfections Flex Shaft Will Fit a Variable Speed Drill Adjusts to a Wide Range of Diameters and Tension Settings Features 2-Inch (51-Millimeter), Medium Grit (220) Stones