Square Washer Type Square Material Steel Material Grade/Class Grade 2 Finish Galvanized For Screw Size 3/8 in Inside Diameter 0.438 in Square Width 2 in Maximum Thickness 0.265 in System of Measurement Inch Minimum Thickness 0.235 in Pack Size Small Pack Resistance Properties Corrosion Resistant Rockwell Hardness B55 Package Quantity 2