A workbench has a vice mounted on the end. The capacity of the vice might be say 6". A lot of times you might want to be working a long piece let's say a sign that is 3 feet long. Hard to clamp in the vice right? No not at all, the vice has either slides or holes or ?? that come above the surface of the bench top, then by placing "dogs" in the holes and having one side of the sign against the dogs the vice is tightned to clamp the wood. You can also use two sets of dogs and wedges to hold things, the dogs can also hold circular items....... These holes might be square/rectangular or simply holes, the dogs can be metal or wood. Maybe some else can do a better job of explaining this but that is the general idea.reds_21 said:dog holes, yes thats it. could you explain how they work and what they are for?