Quality Material: The Valve Lapping Tool Kit is made of rubber and steel, ensuring long-lasting use and resistance to wear and tear (Working Speed : 1000rpm To 1250rpm Max). Compact Size: With dimensions of 13*8cm, this repair tool case is compact and easy to handle, making it for detailed work on your vehicle's engine valves. Versatile Use: This grinding tool is ideal for car maintenance tasks such as repairing and grinding engine valves, making it an essential tool for both professional mechanics and DIY enthusiasts. Easy to Use: Use a thin layer of engine valve lapping compound (not included) around the valve and install the valve in valve guide, Press correct size valve suction cup tool firmly onto head of valve, and use your power drill to slowly the small lapping tool until a suitable finish is obtained. Small Engine Valve Lapper Kit : Each purchase comes with a set of 6 pieces, 1 small engine valve lapping tool attachment, 5 suction cup adapters for use with your automotive, motorcycle, ATV, and small engine valves; providing you with all the necessary tools for a complete valve repair job. Size Chart: 13cmx8cm/5.12inchx3.15inch Package Includes: 1Valve Lapping Tool Kit Note: Please allow slightly errors 1-2cm differences due to manual measurement.