Square Washer, Type Square, Material Steel, Material Grade/Class Grade 2, Finish Zinc Plated, For Screw Size 1/2 in, Inside Diameter 0.563 in, Square Width 3 in, Maximum Thickness 0.28 in, System of Measurement Inch, Minimum Thickness 0.22 in, Pack Size Small Pack, Thickness Tolerance +/-0.031 in