CTA Tools 2224 Valve Lapping Tool, 3/4-Inch For Use on the Lapping Valves on Most Automotive Engines Features a Durable Rubber, Vacuum Cup and Hardwood Handle Diameter: 3/4-Inches or 19-Millimeters Overall Length: 8-1/2-Inches (216-Millimeters) Sturdy Construction Allows for Strength and Durability