Champion RA8HC-8pk Copper Plus Small Engine Spark Plug # 810 (8 Pack) For use in small engines on outdoor power equipment Compatible with lawn mowers, chain saws, pumps and trimmers 14 mm thread, 9-1/2 mm reach and 20.6 mm hex Built to ISO and SAE standards for proven performance Includes: (8) Champion RA8HC Spark Plugs (810)