Made of special alloy steel, heat treated for utmost toughness. Light, trim and streamlined; bright nickel plated. New involute jaw curve gives tooth contact on four points of nuts-increase tooth contact on round work. New, easy-release lever in handle. Thin tapered nose permits working in extremely close quarters. New easy release lever-just press lever and jaws click open. These wrenches are actually 9 tools in one; adjustable end wrench, pipe wrench, thin nose plier, clamp, toggle press, locking wrench, vise, wire cutter and bolt cutter.