Channellock 818N Adjustable Wrench Black Phosphate Coated, 18-Inch Greater jaw capacity supports larger nuts and bolts Longer jaws grip better, Thinner jaws give greater access in tight spaces. Measurement scales (in. on front mm. on reverse) are handy for sizing nuts, pipe and tube diameters 4 thread knurl and non-protruding jaws provide greater capacity; minimal head width improves performance in confined spaces Black Phosphate finish