The Spark doctor from Good Vibrations is an 8 in 1 spark plug wrench and tune up tool for your lawn mower, tractor, generator, ATV, chainsaw, blower ??or most any small engine powered outdoor equipment.? Helps keep your engine starting easy and running strong.? Works for most all size plugs and includes a 5/8 inch socket, ? inch socket and a 13/16 inch socket.? Cleans old spark plugs like new and includes a brass brush, metal file and metal pick.? It can be used for perfect calibration and includes a gap gauge and gapping tool.? There is no assembly required and fits in most any tool box.? ??It also comes with a soft-grip comfort handle.