Industry Leading DurabilityOur Aluminum Sign Base with U-Channel Stub is 5.5 lbs and can be used for indoor or outdoor use. It is recommended to be used indoors, unless base is bolted to the ground. 14.5" diameter base comes with 3 predrilled holes for bolting the base to the ground and post attachment hardware. For stability it is recommended that a 6' post is used. Heavy duty or municipal posts are compatible. Signs 12" x 18" are recommended for use on the base. However, if the base is bolted one can use sign sizes up to 24".USA's Oldest Sign ManufacturerFamily owned since 1918, we take immense pride in our signage. Being one of the oldest certainly means we know this business in and out. Our South Dakota factory is the oldest manufacturer of metal signs in the USA. We have been an integral part of safety and convenience our signs and hardware have provided over the years.Don't Scrimp on QualityWe do not compromise with the quality of our sign hardware and suggest even you shouldn't. Hardware from competitors has a limited life when exposed to the sun, moisture, and rain in the US.