Split Lock Washer, Finish Black Oxide, Material Steel, For Screw Size #10, Inside Diameter 0.193 in, Outside Diameter 0.32 in, Maximum Thickness 0.04 in, Minimum Thickness 0.04 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 +0.006 in, Package Quantity 100