Using a marker or a paint pen, mark where you want your holes to be. Make sure your topper is horizontal and centered with your mailbox before you make your marks.
Using a drill and a 5/16" drill bit, make holes where you made your marks.
Bolt and Washer
Insert the screws in the product holes and place the waterproof washer on the opposite side of the tab (as shown on the picture). Then place the topper on your mailbox.
Place the lock washer on the bolt on the inside of the mailbox and then the wing nut. Tighten the wing nut and you’re good to go!