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 ball-hex keys will drive a fastener at up to a 30 degree angle Sizes include: .050", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32" and 1/4". Color coded red for inch. Plastic holder firmly retains each key in a size marked hole. Made in the U.S.A.