M12 x 24mm OD DIN 125 Low Carbon Zinc Finish Steel Type A General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 SPHERICAL RECESS HOLE DIAMETER: 13.0 MILLIMETERS MINIMUM AND 13.2 MILLIMETERS MAXIMUM PERIPHERAL SHAPE STYLE: 1 RECTANGLE, NO HOLES CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 2.5 MILLIMETERS NOMINAL OVERALL DIAMETER: 23.4 MILLIMETERS MINIMUM AND 24.0 MILLIMETERS MAXIMUM END ITEM IDENTIFICATION: BOX COOLER K-0-0908, K38-0-909, K74-0-0931, K-38-0-0932 MATERIAL: ZINC OVERALL