Box spanners are thinner than a socket and are much longer so that they can be used to loosen or tighten bolts and nuts in narrow recesses, meaning that they are often used in plumbing maintenance and automotive repair. These tubular box spanner is made from bright plated steel and able to accommodate a tommy bar. Size range: 8-22 mm. Set of 8 Consisting of 1 each of 8 x 9 mm x 3.1/4in Long (82mm) Double ended 10 mm x 2in Long (50mm) Single ended 11 mm x 2in Long (50mm) Single ended 12 x 13 mm x 3.1/4in Long (82mm) Double ended 14 x 15 mm x 3.1/4in Long (82mm) Double ended 17 x 19 mm x 3.1/4in Long (82mm) Double ended 21 x 22 mm x 3.1/4in Long (82mm) Double ended 14 mm Spark Plug Spanner MEL9