Large O.D. Oversized Washer, Flat Washer Type Oversized, Dimensional Standards ASTM F844, Material Stainless Steel, Material Grade/Class 316, Finish NL-19, For Screw Size 5/16 in, Inside Diameter 0.344 in, Outside Diameter 1 1/4 in, Maximum Thickness 3/64 in, System of Measurement Inch, Minimum Thickness 3/64 in, Color Silver, Material Quality Standards Not Applicable, Pack Size Small Pack, Resistance Properties Corrosion-Resistant, Rockwell Hardness B80, Thickness Tolerance +/-0.010 in