Silver Lining Custom 911 Blue Reflective Address Sign Vertical 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 and Offset as shown. NOT centered. This 3" Vertical 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.