Special Features:Double Ended Grip Valve Grinding Lapping Stick Tool Set Helps You Properly Match Valve Seats During An Engine Top-End Rebuild.These Tools Include Dual Ends With Oil And UV-Resistant Synthetic Rubber Cups That Help You Put The Finishing Touches On Your Tune-Up.For Hand Grinding Flat Head, Unslotted ValvesSolid And Smooth Surfaced Wood Handle For Better Lapping MovesSynthetic Rubber Vacuum Cups Are Resistant To Oil, Grease, Gasoline And Rubber Are Replaceable