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, Vanadium steel 31CrV3, chrome-plated, Heads finely ground