Box spanners are thinner than a socket & are much longer so that they can be used to loosen or tighten bolts & nuts in narrow recesses meaning that they are often used in plumbing maintenance & automotive repair. These tubular box spanner is made from bright plated steel & able to accommodate a tommy bar. Tubular Box Spanner Set made from bright plated steel. Size range: 0-10BA. Set of 6.