5/16" x 0.875" OD 316 Stainless Steel Large OD Flat Washer / CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.339 INCHES MINIMUM AND 0.359 INCHES MAXIMUM PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.056 INCHES MINIMUM AND 0.071 INCHES MAXIMUM OVERALL DIAMETER: 0.868 INCHES MINIMUM AND 0.890 INCHES MAXIMUM END ITEM IDENTIFICATION: 2320-010465-2174; MRAP - COUGAR; MRAP - COUGAR CAT1 A2 MATERIAL: STEEL COMP 316 OVERALL SURFACE TREATMENT: PASSIVATE OVERALL