18"x12" parking signs are 18" from top to bottom and 12" from side to side. This is the standard size for most handicap, no parking, security and tow away signs. The signs come pre-drilled to easily attach to a pole or fence. 

Aluminum is a thin, lightweight metal that never rusts. It is excellent for indoor and outdoor usage, making it ideal for a wide variety of applications. It is commonly used for real estate signs, security signs, parking signs and street signs.