Smoothing & Raising Die,  fits .401 shank traditional style air hammer or riveting guns. 3" radius high crown head, med alloy steel, fully heat treated. 4 1/4" O.A.L. Use with a shot bag to raise a panel area, by stretching as needed. Adjust output of the die via the regulation of the air hammer and it's air pressure setting will allso allow surface smoothing much like a planishing hammer. Die allows access in some conditions where a standard planishing hammer may not be accessible.