I have various pinch dogs in the workshop and they only get used when I need to fix a piece of round wood, beam, bowl blank or plank in place when sawing, drilling or carving. I am yet to make or buy big ones as used in timber framing, and have easily got by with small ones only a couple of inches or so long. I am over cautious at times, and the idea of using such small dogs to hold such large pieces of wood is not something I would have considered until I had too because they where all I had to hand. As can be seen in the video they do work very well. I bought these years ago, second hand, and they are just mild steel. Great if they get bent as they can be hammered back into shape.