Fastener Seal - Zinc-Plated Steel with Buna-N Rubber Sealing Washer Type Metal Bonded Washer Finish Zinc Plated Metal Material Steel Material Grade/Class Not Graded For Screw Size 7/16 in Inside Diameter 0.427 in Outside Diameter 0.76 in Maximum Thickness 0.061 in Seal Material Buna-N System of Measurement Inch Pack Size Small Pack Package Quantity 5