5/16" x 0.875" OD Low Carbon Zinc Finish Steel USS General Purpose Flat Washer Made in USA / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.375 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.083 INCHES NOMINAL OVERALL DIAMETER: 0.875 INCHES NOMINAL END ITEM IDENTIFICATION: 4120-01-612-0564 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL