Silver Lining Custom 911 Blue Reflective Address Sign Horizontal Plate 3" Numbers Mailbox Marker 2-sided 18" x 6" Home Business CLICK on Customize Now - Enter the numbers you want on your sign. Contact seller before purchase, if you need letters. Dimensions: 18" x 6" Aluminum .063" thick. Custom made with the numbers you enter. Each sign you order can have different numbers. Numbers are on Both sides. This 3" Horizontal sign will hold a total of 5 numbers. Rounded Corners with four (4) Pre-drilled mounting holes (under blue in each corner) for easy installation. INCLUDES two (2) Multi-Purpose Blue Mounting Screws.