1)Material:Aluminum, Brass, Copper, Stainless Steel, Steel Alloys 2)Specification: D10--D20 L10--L220 3)Check: One by one The stregths of drilling parts Feature Material: Brass, Copper, Stainless Steel, Aluminium Specification: nonstandard, as your drawing requriement. Application: It is the main die,the tooling in making screw.Surface Roughness: 0.8s--1.6s Process select material → rough lathing ...