Machine Key Length 20 mm Length Tolerance +0.000/-0.200 mm Material Steel Material Grade/Class Ungraded Finish Plain End Profile Square Width Tolerance +0.000/-0.030 mm Head Height 6 mm Key Type Undersized Tensile Strength 91 000 psi System of Measurement Metric Key Shape Straight Height 6 mm Width 6 mm Rockwell Hardness C15 Made in North America Yes Manufacturer Location Made in USA Package Quantity 25