Feature: 1. Main Function: Use this tool to correct irregularities and eliminate subsurface damage of the new valves for a fit into the valve . 2. 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). 3. Using Steps: Apply a thin layer of engine valve lapping compound (not included) around the valve and install the valve in the valve , 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.4. 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. 5. Saving Time and Effort: Small engine valve lapping attachment kit provides increased control and productivity with less user fatigue, high performance, to use. Specification: Item Type: Valve Lapping Tool Attachment Kit Material: Metal + Rubber Fitment: Universal Working Speed: 1000rpm To 1250rpm Maximum Package List: 1 x Valve Lapping Tool Attachment5 x Suction Cup Adapters