This is the real business end of $100 oil. An object that allowed Howard Hughes to become the richest man in the world by inheriting the patent. They are the world’s most highly engineered pieces of metal. Steel, tungsten carbide or increasingly Polycrystalline Diamond Compact (PDC) toothed drill bits that, in their tri-cone, rotating head form, look like the monster spice eating Sandworms from Dune. Vote for your faves.