My husband has had one of these for several months. The tiny screws that hold it on kept breaking or falling out. But it's definitely worth it. So convenient.

I think it's a shoulder shield. You'd need two of them. The recessed knob areas would support pieces of a crossbeam. Kind of like a slightly more tech-savvy version of the stick across the shoulders with water buckets hanging down either side. This doo-hickey would help stabilize the load and distribute the pressure.

To me, it's a clamp with a handle. I could clamp some boards together, and be able to carry them around by the top piece. Hey. I bet you could clamp some boards together and use the handle to guide them through a jig saw, thereby creating two copies of the same cut.