The GEARWRENCH adjustable spanner wrenches offer a comprehensive line of face, pin, and hook style spanners in the most commonly utilized sizes. They have alloy steel bodies for greater strength and long-lasting durability, and also feature a black oxide finish for improved corrosion resistance. They are useful in industrial applications for adjusting threaded collars, locknuts, packing nuts, and rings. The adjustable heads allow for each wrench to fit on a range of sizes. The wrench sizes are stamped into the handle in a large print for quick and easy identification.