Flange Nut, Material Grade/Class Not Graded, Material Steel, Finish Black Oxide, Thread Size M16-2, Hex Width 24 mm, Hex Height 21 mm, Flange Diameter 33 mm, System of Measurement Metric, Color Black, Flange Thickness 5 mm, Hex Type Flange Nut, Overall Height 21 mm, Pack Size Small Pack, Rockwell Hardness 85-90 Rockwell on 15N Scale, Thread Direction Right Hand