I have just watched a prog on digital tv (Ideal world) and they were demonstrating a drill set that can drill through wood, plaster, brick, concrete, tiles, mild steel, cast iron and bricks. See
They were saying that they were a tipped drill and the tip was cryogenically frozen cobalt. Now I have been around drills all my working life and I can't understand how a drill can keep an edge on these materials. They did demonstrate what would happen with this drill, compared to a carbide tipped drill, by pushing it tip first into a normal carbide grinding wheel. Their drill formed a groove in the wheel, the carbide tipped drill had its tip ground back.
Has anyone come across them before?
Dave