For use on Lambda sensors (oxygen sensors) on most modern cars. This tool covers a wide variety of options and fits most heated and non-heated sensors. Suitable for most modern cars including: Audi, BMW, Citroën, Ford, Mercedes-Benz, Peugeot, Renault, Skoda, Vauxhall, Volkswagen.1/2"D Sizes: 29mm x 90mm long, 27mm x 85mm long, 22mm x 50mm long, 3/8"D sizes: 11/16" x 74mm long, 22mm (7/8") x 80mm long, 22mm (7/8") x 90mm long, 22mm (7/8") x 30mm long. Manufactured from chrome molybdenum.