I - beam or steel beams, is a rectangular steel I - section - beams normal I - beams and light I - beams, H - shaped steel Thr I-steelI - beam or steel beams, is a rectangular steel I - section- beams normal I - beams and light I - beams, H - shaped steel Threebeams are widely used in a variety of structures, bridges, vehicles, fixtures, machinery, and so on I-steel