For universal use on SOHC and DOHC engines. Combustion chamber is pressurised via the supplied spark plug air line adaptor which holds the valve in place during the valve spring compression operation. Single handed operation. Airline adaptor has 18mm/14mm (male) threaded end to fit spark plug hole. Width - 570mm x Height - 55mm x Depth - 205mm Fast set up time due to the twin rail pivot system. Includes compressed air adaptor to hold the valves closed while the springs are in place, allows the removal of valve springs and valve stem oil seals with the cylinder head in place, fast set up time due to the twin rail pivot system. Supplied in plastic storage case., Weight: 11.0231131 Pounds, Manufacturer: Autojack