The Faithfull Chrome Adjustable Spanner has a knurled adjustment screw that enables the jaws to fit various sizes of bolt and nut head. This chrome vanadium steel wrench is forged, hardened and tempered with a matt chrome-plated finish. Particularly useful when only a limited number of tools can be carried or kept in a tool kit. An ideal general maintenance tool. This Faithfull Chrome Adjustable Spanner has the following specification:Jaw Capacity: 15mmLength: 100mm (4in) Faithfull Chrome Adjustable Spanner 100mm (4in) in Silver