Unfortunately my "shop" right now is just a harbor freight portable garage in the back yard, I am very new to blacksmithing and am just glad to have a place to work out of the rain, so bolting it to a wall isn't an option right now. I will probably just bolt it to the table and put a block in the ground under the leg for now and hopefully that works. I didn't measure the jaws but I would guess 5 or 6 inches, probably 5. I actually got a great deal from one of the guys that taught me blacksmithing at a local historical society, sold it to me for what he paid years ago at $65. He knew he could get way more and I am very grateful.