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MetalSee more details at JEGS High Performance .04 starGood Quality PartDecember 2 I'd recommend using a high wear resistance grease on the threads (nickel-based never seize works), and a thin oil or non-stick treatment on the face of the dies.The dies themselves are well fitted and accurate, I've made a half-dozen holes so far without any noticeable signs of wear. HEMAN Summit Racing Equipment