CMA-366 CMA-366 spans truss systems for easy overhead installation of equipment in buildings and exhibit booths. Spans 5–18" / 12.7–45.7cm. Accommodates truss using up to 2" (5.1 cm) OD round or 1 7/8" (4.7 cm) square pipe. Accepts 1 1/2" NPT extension column and allows cable routing through the column Weight Capacity: 250 lbs. (113.3 kg)