Creating value for customers across a variety of fields, through manufacturing, engineering, and support services of exceptional strength. Bull Moose produces Hollow Structural Sections (HSS) from 2" square to 12" square and corresponding rectangles. Charpy V-Notch HSS available in wall thickness up to 0.625". Largest Metric HSS producer in North America. HSS available in additional yield strengths of 70, 80, 100 and 110 KSI. HSS available in weathering grade steel. ASTM A500, A847, A1085, and EN 10219. (less)