Fender Washer, Flat Washer Type Oversized, Material Stainless Steel, Material Grade/Class 316, Finish Plain, For Screw Size 5/16 in, Inside Diameter 0.328 in, Outside Diameter 5/8 in, Maximum Thickness 0.071 in, System of Measurement Inch, Minimum Thickness 0.056 in, Inside Diameter Tolerance +/-0.010 in, Material Quality Standards ASTM A276, Outside Diameter Tolerance +/-0.010 in, Pack Size Small Pack, Resistance Properties , Saltwater , Solvent