CTA Tools 2282 Standard Duty Engine Cylinider Flex Hone, 4-5/8-Inch / 118mm 180-Grit Silicon Carbide Surface and Resilient and Flexible with a Soft Cutting Action Ball-Type Stones Produce a Controlled Surface Condition For Use on Engine and Brake Cylinders, Hydraulics, Valve Guides, Lifter Bores, Diesel Cylinders, Cam Bearings and More Engine Cylinder Hone Size: 4-5/8-Inches / 118-Millimeters Choose the Right CTA Tools Flex-Hone Tool According to Bore Size