CTA Tools 2310   Engine Cylinder Hone, 51 To 178-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 4-Inch (102-Millimeter), Medium Grit (220) Stones