A pair of 6inch Aluminum Vise Jaws with serrated fixture rail made out of 17-4PH, heat treated to H900, provide excellent clamping in all types of material.  Use them to bite into a work piece for extra holding power or use the 45 degree dove tail. Serrated 17-4PH rails sit 0.10" above the aluminum carrier jaw to grip your stock. Designed to work on traditional 6" Kurt style machine vise with a 1/2" bolt pattern spacing of 3.875 between hole to hole and 0.94" high from vise bed .  T