Split Lock Washer Finish Black Oxide Material Steel For Screw Size #6 Inside Diameter 0.141 in Outside Diameter 0.216 in Maximum Thickness 0.03 in Minimum Thickness 0.03 in Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C40 to C50 Package Quantity 100