TriActive USA’s CRTP assumes usage of American standard size tubing, namely 4” x 4” square tubing x 11ga, 1-1/2” x 3” rectangular tubing x 11ga, 1-1/2” Sch. 40 pipe, 1-1/4” OD round tubing x 11ga, ¼” hot rolled flat bar, 1-1/2” OD round tubing x 14ga, 1/8” square sheet metal seats and back rests. TriActive USA Fitness Equipment does not include any of the following: exposed cables, hydraulics or plastic seating.