Wikipedia 4140 billet machined, heat treated, black oxide coated Compact, dedicated castle nut wrench designed for use with torque wrenches Versatile design includes a 2 lug wrench (for castle nuts with wrench notches partially obscured by end plate, sling adapters) and a conventional 3 lug wrench Precision machined to tightly hold the castle nut while turning the torque wrench
