Best quality chrome nickel alloy steel. Hardened and tempered for maximum life. Ends are beveled, slip easily into screws. Wrenches easily replaced by removing a single bolt; snap into right angle position, can be used at any angle. Folds up like knife. 5-1/4′ long handle fits the hand; easy-to-grip and turn. Sizes include 3/16′, 7/32′, 1/4′, 5/16′, 3/8′.