Acorn Cone Dies are designed with a straight hook angle for production threading work on steel parts using screw machine or other threading equipment. They are designed to project from the die holder with a short die chamfer for close to the shoulder threading. They are also known as Spring Dies, Taper Nose Dies, Acorn Dies, and Cap Adjusting Dies. (Advise if threading stainless or non-ferrous metals when ordering as they require a different hook angle.)