Reliable PWHDG14MR Ring Washer, 5/16 to 21/64 in ID, 47/64 to 3/4 in OD, 3/64 to 5/64 in Thick, Steel

These flat washers are made of galvanized steel. They provide a greater bearing surface under the fastener, which prevents the screw, bolt or nut from pulling through the material.