I have that exact model, sort of a universal tool back when. For its size it is pretty lightweight, the body is hollow, sure wouldn't want to clamp down real hard on anything. The screw has very limited travel, so there is a pin that slides out allowing the lower beam several inches of movement. Some similar models have a hollow shaft in the screw allowing a drill devise to be used on what is clamped. I have mine bolted to the far end of the bench, use it for light work. Have seen a near twin to mine in a 1910 catalog.