3/8"I.D. x 3/4"O.D. x 3/8"Thick Rubber Grommet / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.375 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.375 INCHES NOMINAL OVERALL DIAMETER: 0.750 INCHES NOMINAL END ITEM IDENTIFICATION: MRAP - UNIQUE NSN - USED ON 3 MRAP VARIANTS; MRAP - COUGAR MATERIAL: RUBBER OVERALL