Square Washer Type Square Material Steel Material Grade/Class Grade 2 Finish Hot Dipped Galvanized For Screw Size 7/8 in Inside Diameter 0.938 in Square Width 4 in Maximum Thickness 0.265 in System of Measurement Inch Minimum Thickness 0.235 in Color Silver Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness B55 Thickness Tolerance +/-0.031 in