The BA18012 bracket is for either flat street name signs or extruded street name signs and designed to mount on a U Channel sign post. The BA18012 bracket has a 12” slot length and holds your street name at 180 degrees.(Parallel to stop sign). Typically used with todays larger 9" height street name signs. A small hole is drilled on each side of the slot and tapped to accept a 5/16” set screw. All brackets come with standard set screws and all necessary mounting hardware.