Made with Eklind alloy steel that is heat treated for optimum strength and ductility and a black finish to resist rust. Includes: Long Series Hex-L key set with Holder; inch 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, Short Series Hex-L key set with holder; MM Sizes: 1.5, 2, 2.5, 3, 4, 5, 6, 8, and 10.