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".