Split Lock Washer Finish Black Oxide Material Steel For Screw Size 1 5/8 in Inside Diameter 1.633 in Outside Diameter 2.487 in Maximum Thickness 0.344 in Minimum Thickness 0.344 in Color Black Dimensional Standards ASME B18.21.1 Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness C38 System of Measurement Inch Thickness Tolerance +0.030 in Package Quantity 10