Square Washer, Type Square, Material Steel, Material Grade/Class Grade 2, Finish Black Oxide, For Screw Size 1 in, Inside Diameter 1.062 in, Square Width 2 in, Maximum Thickness 0.265 in, System of Measurement Inch, Minimum Thickness 0.235 in, Color Black, Pack Size Small Pack, Resistance Properties , Rockwell Hardness C40, Thickness Tolerance +/-0.030 in