High quality, industrial grade, professional set. Made with Eklind Alloy Steel. Heat treated for optimum strength and ductility. Finished with Eklind Black Finish to resist rust. Eklind Ergo-Fold fold-up sets have a hard plastic shell that is stronger than steel and a soft plastic over mold for comfort and slip resistance to enhance your safety Set includes: 3mm, 4mm, 5mm, 6mm, 8mm and 10mm. 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. The ergonomic shape fits comfortably in your hand. Color coded blue for metric. Made in the U.S.A.