Professional adjustable spanner for commercial or occasional use 18 / 450mm adjustable spanner (this is the total length) 0mm - 53mm jaw opening Manufactured form chrome vanadium steel for strength and durability Metric measurements but will any measurement really Thick end of the adjustable spanner for a maximum grip on the nuts and bolts Precision machined finishing jaws Spanner has a cut out on the end so that they can be hung up for easy and convenient storage.