Socket Spanner

This spanner consists of a ring- type head with a square hole at the rear designed to lock into various types of handle. They are available in sets, offering a range of heads, spacer drive bars and handles. Sockets are generally required when torque wrenches are used to tighten nuts and bolts.

A variation of this design Is the wheel nut spanner which, in its simplest form, consists of two double-ended socket and spanners fixed together at right angles. Considerable pressure can be applied with this type, and care must be taken not to over-tighten.