Machine Key, Length 1 in, Length Tolerance +0.000/-0.100 in, Material Steel, Material Grade/Class Ungraded, Finish Plain, End Profile Tapered Gib, Width Tolerance +0.000/-0.002 in, Head Height 5/8 in, Key Type Bilateral, Tensile Strength 64,000 psi, System of Measurement Inch, Key Shape Gib Head, Height 3/8 in, Width 3/8 in, Rockwell Hardness B85, Features Tapers 1/8 in per ft, Made in North America Yes, Manufacturer Location Made in USA*, Pack Size Small Pack