GC/AAA Fences Wood to Steel system utilizes galvanized steel posts for panel attachment. The posts are 40 weight pipe and are either set in concrete or core drilled into concrete. In wet ground the posts may be driven 3' - 4'. Brackets are placed over the posts for panel attachment. GC/AAA also uses PostsMaster Fence System. These posts are galvanized, and are set in concrete or driven. They are easily hidden for the natural wood post look if required.