I made mine by using bars that I got from a purchase here. The bars were about 3/8" to 1/2" thick and about 2 1/2" wide. I just made some wire hangers for them to hang in front of the vise jaws. Work like a charm! The lead (aboujt 16 to 18bhn) being nice and thick forms itself to what ever steel I put in the vise. It is especially nice for clamping round stock when I run dies over it to thread it. It will loosen a bit as the lead deforms ...just give it a snug and good again,