Pin Spanner wrenches are drop forged from steel bar. These wrenches are available for circle diameters from 1" through 6", with pin diameters from 3/16" through �". They are available in an Industrial Black finish. They cover several nut sizes. The forged pins and hooks offer extra toughness and longer life. The wrenches are often used to tighten shafts or pipes. These are special purpose fixed wrenches designed for servicing packing glands, adjustable collars, rings, locknuts, etc.