Franken Jaws are for 6 inch Kurt Vises. They are soft steel (1018) with a .10″ deep by .15″ wide step and a built in adjustable stop that will always be below the top of the vise jaw. The stop uses a dovetail and an M3 set screw to create a quick adjustment and a positive stop for your work piece. $85 per set, free shipping to continental United States