Comparison : Item # WFB-4000-4000-416, Wide Flange Beams
Item # WFB-5000-5000-500, Wide Flange Beams
Item # WFB-5000-5000-515, Wide Flange Beams
Item # WFB-6000-4000-590, Wide Flange Beams
Item # WFB-6000-4000-600, Wide Flange Beams