Bedrock Haven/Commercial Aluminum pool panels come in 4′ and 5′ Heights….They are 6′ Wide with 2 rails (flush top and bottom).
Both 4′ and 5′ high meet pool code requirements.
Commercial grade uses 3/4″ x 3/4″ square pickets and also 2-1/2″ x 2-1/2″ square aluminum posts.
Click here for more information: http://www.activeyards.com/solutions/pools/bedrock