Beveled Washer, Flat Washer Type Beveled, Material Steel, Material Grade/Class Grade 5, Finish Black Oxide, For Screw Size 5/16 in, Inside Diameter 0.344 in, Outside Diameter 3/4 in, Maximum Thickness 0.125 in, System of Measurement Inch, Minimum Thickness 0.125 in, Inside Diameter Tolerance +/-0.010 in, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Rockwell Hardness C4, Thickness Tolerance +0.005/-0.004 in, Package Quantity 25