This 72" crossmember is constructed from durable 12 gauge galvanized steel to ensure long-lasting performance and rust resistance in marine environments. The 3"x3" profile and 8.75" drop center. Flanges for secure mounting and support are 7.25" x 3.37" Pre-drilled holes for easy installation: Includes precision-drilled holes for mounting and fitting lights or accessories, ensuring seamless replacement. Drop center measured from the top of the flange.