Beveled Washer, Flat Washer Type Beveled, Material Steel, Material Grade/Class Grade 2, Finish Black Oxide, For Screw Size 1 in, Inside Diameter 1.031 in, Outside Diameter 2 in, Maximum Thickness 0.312 in, System of Measurement Inch, Minimum Thickness 0.312 in, Inside Diameter Tolerance +/-0.010 in, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Rockwell Hardness B55, Thickness Tolerance +/-0.010 in