Manually grind and lap valves with this pair of valve lappers, offering four different sizes suction cups/ The valve grinders are manufactured with high-quality wooden handles each with two rubber end cups, for efficient and comfortable manual grinding. Features and Benefits Pair of valve grinders for manual engine valve lapping Shaped wooden handles for comfort Rubber end cups sized to stick to valves for accurate grinding Four cup diameters to fit a range of engine heads Typical Applications Use with grinding paste for lapping and grinding valves