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. Plastic holders firmly retains each key in a size marked hole Includes: EKL10213 (sizes: 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm and 10.0mm short keys) and EKL10509 (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). Colored coded red for inch, blue for metric. Made in the U.S.A.