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.