Eklind 25919 Ergo-Fold Key Set 9 Piece 5/64"-1/4" Ball Hex Made in U.S.A. High Quality, Industrial Grade, Professional Tools. Made with Eklind Alloy Steel. Heat Treated for optimum strength and ductility. Finished with Eklind Black Finish to resist rust. Eklind Ball-Hex Keys will drive a fastener at up to a 30 degree angle. Fold-up sets include a variety of popular sizes in one convenient handle to keep you from losing individual keys. Fold a key out to a right angle to get maximum leverage. Fold a key out completely to operate like a screwdriver. Eklind Ergo-Fold Fold-up sets have a hard plastic shell that is stronger than steel and a soft plastic over mold for comfort, slip resistance and safety. The ergonomic shape fits comfortably in your hand. Made of chrome nickel alloy steel. Hex corners are sharp and clean. Key can be held at an angle by the flat spring in the bottom of the case. Sizes marked on handle.