Abstract: A beam is provided with hole patterns allowing for increased configurations and tolerances for assembly into a structure. The beam has four side plates and two end plates. The four side plates can have any modular length that is determined by a number of repeating sections. Oppositely oriented side plates have sections with the same hole pattern. In one embodiment, two side plates have hole pattern A and the two other side plates have hole pattern B. The end plates have hole pattern C. Hole pattern A has outer corner and side holes that are straight slots with a longitudinal axis oriented perpendicular to end plate planes. Hole pattern B has outer corner and side holes that are straight slots with a longitudinal axis that is oriented parallel to the end plate planes. Hole pattern C has curved slots that lie on a perimeter of one of two circles.