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. Plastic holders firmly retains each key in size marked hole Includes: EKL10213 (sizes: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm and 10.0mm long keys) and EKL10609 (sizes: .050", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" and 3/8" long keys). Color coded ed for inch and blue for metric. Made in the U.S.A.