Semi Truck Tractor Mailbox Topper Metal Mailbox topper is cut from steel about as thick as a nickel. Tabs are bent for attachment to mailbox. This large mailbox topper is 17" wide and 8" tall. It fits onto standard mailboxes and looks size-appropriate on large boxes as well! Sign has been powder-coated for a durable and long-lasting finish. You will need to drill 2 holes into top of box, so washers are required to prevent moisture from entering mailbox. Hardware to attach to mailbox is included in your order. The mailbox topper is designed so you could also attach it to a wood fence or railing. All of our products are 100% made in the USA and made to last. Watch for more mailbox toppers to come in our shop!