for easy and accurate determination of the ignition TDC (top dead centre) especially suitable for vehicles which have no TDC markings measurement unit with magnetic holder connecting tube with spark plug or glow plug adaptor in 8 -10 -12 -14 -18 mm + universal cone adaptor 60 and 160 mm aluminium adaptor tube for deep seated spark plugs, Weight: 0.3968320716 Pounds, Manufacturer: BGS technic