Large O.D. Oversized Washer, Flat Washer Type Oversized, Dimensional Standards AMPG 2001 FL.01, Material Stainless Steel, Material Grade/Class 18-8, Finish Plain, For Screw Size 4 in, Inside Diameter 4.125 in, Outside Diameter 7 1/2 in, Maximum Thickness 5/16 in, System of Measurement Inch, Minimum Thickness 5/16 in, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM A582, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack