The Martin Tool Adjustable Face Spanner is expertly crafted from drop forged steel bar, providing extra toughness and a longer lifespan. It is available in a wide range of capacities, from 1/4" to 4", with pin diameters of 3/16", 1/4", and 5/16". The wrenches feature an Industrial Black finish and can cover various nut sizes. These special purpose wrenches have a unique adjustable opening feature, making them ideal for tightening shafts or pipes and servicing packing glands, adjustable collars, rings, locknuts, and more.