Split Lock Washer Finish Black Oxide Material Steel For Screw Size 1 1/8 in Inside Diameter 1.129 in Outside Diameter 1.903 in Maximum Thickness 0.345 in Minimum Thickness 0.345 in Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C40 to C50 Package Quantity 5