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. 4-1/4′ long handle fits the hand; easy-to-grip and turn. Sizes include .050′, 1/16′, 5/64′, 3/32′, 7/64′, 1/8′, 9/64′, 5/32′, 3/16′.