China Tools Materials: tungsten carbide or mold steel Main parts for cold heading process: Quill (cut off die), cutter (cut off blade), punch, taper dies. No matter your material is case harden steel or through harden steel, our full set dies can run in a good lifetime. High precision dies produced according to your drawing. And we can also provide tools design service according to your roller headers. China Tools website:http://www.bearingroller.com/tools/