M5 x 15mm OD DIN 7349 Low Carbon Zinc Finish Steel Extra Thick General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 5.3 MILLIMETERS NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 2.0 MILLIMETERS NOMINAL OVERALL DIAMETER: 15.0 MILLIMETERS NOMINAL END ITEM IDENTIFICATION: 01-607-9674 MATERIAL: STEEL OVERALL SURFACE TREATMENT: ZINC OVERALL