Stainless Steel Flat Washer, Plain Fastener Finish, Fits Bolt Sizes #4/ CROSS-SECTIONAL SHAPE STYLE: 1 RECTANGULAR HOLE DIAMETER: 0.125 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 ROUND CENTER HOLE SHAPE STYLE: 1 ROUND THICKNESS: 0.031 INCHES NOMINAL OVERALL DIAMETER: 0.3125 INCHES NOMINAL END ITEM IDENTIFICATION: 6150-01-633-6567;LOAD BANK,ELECTRICAL PART NAME ASSIGNED BY CONTROLLING AGENCY: FLAT WASHER MATERIAL: STEEL PROPERTY CLASS 18.8 OVERALL