A useful tool to allow you to turn over the engine without having to go to the ignition switch, ideal for compression testing or bumping the engine over to TDC (top dead center) timing marks for valve, distributor or camshaft adjustment. Power tool type trigger switch for regular use with medium currents. Heavy duty Neoprene leads 10-Amp, medium current clips open to 1/2” . Protective rubber boots prevent electrical shorts. Ergonomic handle. NOTE: Will not start manual transmission vehicles that have a neutral safety switch enabled. Simply connects from the main starter/battery terminal to the solenoid operating terminal. Care must be taken to ensure car is in neutral.