Ray gave me this link earlier in the year and they drilled saw-plate like a hungry otter through cheese. (Perhaps a little indentation to start them, if I recall ??) Maybe it's already on here, but ... http://www.amazon.com/Chicago-Latrobe-High-Speed-Uncoated-Conventional/dp/B006O2S4XI
They don't have time to eat it ... they're tunneling through it to get to a ... ?? turnip? mouse? How'dya think they make Swiss cheese?