Machine Key Length 12 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 4 mm Key Type Undersized Tensile Strength 91 000 psi Standards RoHS Compliant System of Measurement Metric Key Shape Straight Height 4 mm Width 4 mm Rockwell Hardness C15 Made in North America Yes Manufacturer Location Made in USA Pack Size Small Pack Package Quantity 25