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.