M6 x 12mm OD DIN 125 Low Carbon Plain Finish Steel Type A General Purpose Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 6.6 MILLIMETERS NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 1.2 MILLIMETERS NOMINAL OVERALL DIAMETER: 13.0 MILLIMETERS NOMINAL END ITEM IDENTIFICATION: MRAP - MRV; MAXXPRO DASH ISS W/CROWS AND W/OGPK HARDNESS RATING: 38.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM MATERIAL: STEEL OVERALL PROPRIETARY CHARACTERISTICS: NPAC