... good finish surface Polycrystalline Diamond dies for wire drawing is polymerized with synthetic diamond single crystal, adding a small amount of silicon, ... drawing industry. Used for aluminum wire, copper wire, stainless steel wire, alloy wire etc..size rangetolerancecasing ref. Size inchmmmmmm ≤0. ... copper plated steel wire, tungsten wire etc. Large Size Polycrystalline Diamond Dies for wire drawing