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. Fold up sets include a variety of popular sizes in one convenient handle to keep you from losing individual keys Sizes include: 3mm, 4mm, 5mm, 6mm, 8mm and 10mm. Fold a key out to a right angle to get maximum leverage. Fold a key out completely to operate like a screwdriver. Eklind Classic steel fold-up sets are compact to fit most easily in your pocket. Made in the U.S.A.