Machine Key Assortment, System of Measurement Inch, Material Steel, Material Grade/Class Ungraded, Finish Plain, Thickness Tolerance +0.000/-0.002 in, Length 1.5 in, Number of Pieces 70, Number of Sizes 6, Manufacturer Location Made in USA*, Includes (10) 1/4x1/4 in, (12) 3/16x1/4 in, (12) 3/16x3/16 in, (20) 1/8x1/8 in, (8) 3/8x3/8 in, (8) 5/16x5/16 in, Plastic Compartment Box with Lid Chart, Product Type Machine Key Assortment, Key Shape Straight, Rockwell Hardness B80/90