Doctor Drill Bit & Aircraft Extension Long Drill Bits

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First off I have found there are many diferent styles of long drill bits. First off There is the AIRCRAFT Extension Drill. This is a drill bit that normally comes in either 6" or 12" lengths and is made from High Speed steel or Cobalt. It is made in both Fractional sizes and Number Sizes. It's primary use is for reach. These come in a short flute length but a long shank. This bit is used heavily in aircraft and transportation manufacturing. I found out at http://www.DrillBitWarehouse.com they can manufacture aircraft extension bits up to 12 feet in length.