Split Lock Washer Finish Black Oxide Material Steel For Screw Size 7/16 in Inside Diameter 0.44 in Outside Diameter 0.644 in Maximum Thickness 0.14 in Minimum Thickness 0.14 in Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C46 Package Quantity 25