Split Lock Washer Lock Washer Type Split Lock Finish Black Oxide Material Steel For Screw Size M16 Inside Diameter 16.2 mm Outside Diameter 24.4 mm Maximum Thickness 3.5 mm Minimum Thickness 3.5 mm Dimensional Standards DIN 7980 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C44 Package Quantity 25