Split Lock Washer Finish Black Oxide Material Steel For Screw Size 1 1/4 in Inside Diameter 1.254 in Outside Diameter 1.99 in Maximum Thickness 0.244 in Minimum Thickness 0.244 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 +0.020 in Package Quantity 10