The frame mount kit uses aluminum extrusions and stainless steel clamps (sold separately) for a maintenance free installation. Large overhead signs with hardware kits installed have a maximum support to eliminate wind vibration. The hardware kit requires no field assembly but still allows clamp adjustment to match mast arm angle. The mast arm hardware kits can be mounted with pop rivets or with VHB (Very High Bond) tape which does not interfere with graphics on the front of the sign.