Features and Benefits: High quality, industrial grade, professional set; Made with Eklindr Alloy Steel; Heat treated for optimum strength and ductility; Finished with Eklindr Black Finish to resist rust; Plastic holder which firmly retains each key in a size marked hole; Hex-L Key Set Long Arm 7-Piece 5/64 in. 3/32 in. 1/8 in. 5/32 in. 3/16 in. 7/32 in. 1/4".