Speedbor MAX Self-Feed Wood Bits
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Speed Bore Bits
I had to drill a 3" blind hole in a 10" oak beam, overhead and inside of a wall. You could not see what you were doing. These bits are a life saver. Make sure you have both hands on the drill though because these are the most agressive bits I have ever used. Uses a cool quick disconnect extension also. A must have for those impossible holes!