Double ended 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.
This tubular box spanner is made from bright plated steel and able to accommodate a tommy bar.
The Melco TIM13 ISO Metric Box Spanner is made with 4mm steel and has a black powder coated finish. With the following specification:
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