Brand New Shank Valve Lapping Tool Attachment with 16/20/30/35/45MM Suction Plates Electric Valve Grinding Tool Set Auto Repair Tools Main Function: Use this tool to correct surface irregularities and eliminate subsurface damage of the new valves for a perfect fit into the valve guide. Working Speed: Valve lapping tool attachment works from 1000rpm to 1250rpm Maximum, the direction can be changed automatically, easy for valve insertion. Use with a fine grinding paste (not included). Using Steps: Apply a thin layer of engine valve lapping compound (not included) around the valve and install the valve in the valve guide, press the correct size valve suction cup tool firmly on the valve head, then slowly rotate lapping tool with a power drill (not included) until you get the suitable finish. Applications: 1pc small engine valve lapping tool attachment and 5pcs suction cup adapters can be used for your automotive, motorcycle, ATV, and small engine valves.