Bases and address plates are cast using high grade aluminum providing strength, durability, and unsurpassed quality. - Post System utilize an extruded aluminum pole. - Every post has a wall thickness of .109" and meets all ASTM Standards. - C1 System is available with Number Plate: 4 only. - Vinyl numbers are available for plates #4. - 2" Brass numbers can be used on plates #4. - Post and base is available in Black(stock color), Green, Bronze and White (custom colors). - Leadtime is approximately 3 weeks for custom colors. - Economy galvanized steel mailboxes comes with bolster plate and hardware.