GearWrench® Spanner Wrench, Adjustable Face, 3 in Capacity, 8.13 in OAL, 1/4 in Pin Diameter, 3/16 in Pin Length, Flat Handle, Specifications Met: US Federal Specification GGG-W-665C, Forged Alloy Steel, Black Oxide.The GearWrench® adjustable spanner wrenches offer a comprehensive line of face, pin, and hook styles in the most utilized sizes. They are made from alloy steel for great strength and durability and feature black oxide finish for corrosion resistance. They are used for adjusting threaded collars, packing nuts, locknuts, and rings in industrial applications. The adjustable heads allow for wrenches to be used on a range of sizes. The wrench sizes are stamped in the handle and are large for quick and easy identification.