Conical Washer, Material Steel, Material Grade/Class Not Graded, Finish Black Oxide, For Screw Size M3, Inside Diameter 3.2 mm, Outside Diameter 7 mm, Overall Height 0.85 mm, Dimensional Standards DIN 6796, System of Measurement Metric, Pack Size Small Pack, Rockwell Hardness C43 to C50, Package Quantity 100