Machine Key, Length 2 1/2 in, Length Tolerance +0.000/-0.030 in, Material Steel, Material Grade/Class Grade 1018/Grade 1045, Finish Plain, End Profile Square, Width Tolerance +0.000/-0.002 in, Head Height 3/8 in, Key Type Undersized, Tensile Strength 64,000 psi, Standards ANSI B17.1, System of Measurement Inch, Key Shape Straight, Height 3/8 in, Width 3/8 in, Rockwell Hardness B50, Made in North America Yes, Manufacturer Location Made in USA*, Pack Size Small Pack, Package Quantity 10