Everything everyone said about fall protection is 100% correct. The 5000 LB figure, and Mad's description of how the figure is arrived at. I also agree with the comment that no way is this a beam clamp. The basic design looks like a modern beam clamp, but as was noted after my comment, it does appear to be cast, and does appear to have square nuts. So ya, it looks like a modern beam clamp for fall arrest but I agree it is not for that purpose. My shoot from the hip observation was wrong, I do agree.