3/8" x 1.000" OD Thru-Hardened Yellow Zinc Finish Steel USS General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.438 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.083 INCHES NOMINAL OVERALL DIAMETER: 1.000 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP - COMMON NSN - USED ON 3 MRAP VARIANTS AND 19 OTHER WEAPON SYSTEMS SPECIAL FEATURES: 3/8"USS YLW Zinc Plated Thru Hard High Strength Flat Washer MATERIAL: STEEL OVERALL