Probably the oldest front vise design is the leg vise. It's called a leg vise because one of the bench's legs is an integral part of it - usually forming the inside jaw. The outside jaw also goes all the way to the floor - or nearly so. There is a single screw mounted between a quarter and a third of the way down that goes through both jaws with the nut on the back of the leg. Finally, there is some sort of horizontal beam at the bottom to act as a fulcrum. This beam may take the form of a board that can be adjusted by means of holes and pegs, or it can even be another screw. The leg vise is probably the simplest and least expensive of the front vises, and it is very strong.