The all-steel 1175-18 extension bracket from Lemco is protected with a durable black polyester powder coat to prevent corrosion. Eight inches of vertical pole clearance are required for installation. It can be installed on all types of poles. Slots are provided for banding to cement, steel, or fiberglass poles. For mounting to wood poles, standard bolt holes are available for use with 5⁄8” thru-bolt and two 1⁄ 2” x 4” drive-type lag bolts, (not supplied).