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The OEMTOOLS Valve Lapper has a 5/8" and 13/16" rubber vacuum cups for most small valve automotive applications. The valve lapping tool will make lapping valves on your cylinder heads a snap. It features a sturdy hardwood handle and rubber suction cups to firmly hold the valve while lapping.Warning: This product can expose you to chemicals which are known to the State of California to cause cancer or reproductive defects. For more information, go to www.P65WARNINGs.ca.gov^