The Mast Arm Post mount is constructed using two individual posts that intersect at 90 degrees. The upright is a 4" x 4" extruded aluminum posts with 12" x 12" welded base plate. Base plate is a 3/8" thick aluminum plate with predrilled anchoring holes and 4 - 4" high welded gussets. The horizontal is a 2.25" x 3" post. The upright and horizontal posts are secured using a structural gusset that is an 18"h x 18"w x 3/8"d aluminum plate. Finish is Duranodic Bronze, unless otherwise noted. For use with a single Clearance I-Bar up to 6ft long only.
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