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