Hidden contact long drill bits?

["Bill" <bill190nospam@xxxxxxxxx>]

Where do you get *very* long drill bits for drilling from a door or window
through the wall and up into the attic?

The kind I have seen have a narrow 5 ft. long rod welded to a regular drill
bit, then there is a hole drilled through the end of the bit and at the end
of the rod. Then when you have drilled a hole through to the attic, you can
thread a wire through the end of the drill bit, then pull the wire back out
through the hole you just drilled.