With two magnets · For use in confined spaces with jointed tools 3/8" or 1/2” square drive or tommy bar Ø 8 mm · With powerful magnets in the hexagon surface, which hold the spark plug safely on the hexagon · Wide opening gives space to the spark plug and makes it easier to put on the socket in confined areas · The ceramic core of the spark plug remains untouched · GEDORE vanadium steel 31CrV3, chrome-plated, polished head