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 Melco tubular box spanners are made from bright plated steel and able to accommodate a tommy bar. The 8 piece set comprises: 8 x 9 mm x 3.1/4in Long (82mm) Double ended10 mm x 2in Long (50mm) Single ended11 mm x 2in Long (50mm) Single ended12 x 13 mm x 3.1/4in Long (82mm) Double ended14 x 15 mm x 3.1/4in Long (82mm) Double ended17 x 19 mm x 3.1/4in Long (82mm) Double ended21 x 22 mm x 3.1/4in Long (82mm) Double ended14 mm Spark Plug SpannerAdditional Information:Box Type: Set