Function: Valve patch tool helps to correctly install valves in your vehicle engine by correcting surface smoothness and eliminating damage for a steady fit in valve control. Use with fine grind paste for optimal results. Wide range of uses: The valve grinding tool kit includes a pluggable suction cup to install and secure vents in a lawnmower, chainsaw, car, or motorbike; Oil and UV resistant. 5-Inch Rubber Roller: The small motor valve includes a 5-inch rubber roller, which has two 5/16-inch steel handles to fit your drill and included suction cups. Powerful performance: Minimum working speed of electric drill accessories 1000 RPM; Maximum working speed 1250 RPM, with high control and productivity, and reduces fatigue. Easy to use: Remove all carbon deposits from the valve and valve control; Apply a thin layer of grinding compound around the valve and install the valve in the valve control, push the suction cup to the valve head, and use a drill to slowly rotate the small patch tool until a suitable finish is obtained. Spec: Item Type: Valve Lapping Tool Material: Rubber + Metal Passage: Universal Packing List: 2 x Valve Lapping Tool