If you often have to repair engines, and in particular change valves. You will definitely need a specialized tool. The hand lapping tool allows you to lap both intake and exhaust valves. The tool is a handle, at both ends of which there are suction cups. They are made of oil-resistant rubber and the handle is made of wood. The suction cups are 0.6, 0.8, 1.1, and 1.4 inches.