Nothing drills like cobalt. While made for hard metals, these bits actually do great on wood as well. I use them on both. Compared to high speed steel on wood, these bits stay sharper and penetrate very well without clogging. Of course, when drilling through holes, they will have some tear-out on wood. The Bosch set is a very good value for cobalt bits, and the box is top notch.Click Here to see more reviews about: Bosch CO4029 Cobalt Twist Drill Bit Assortment with Metal Index, 29-Piece
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Bosch CO4029 29 Piece Cobalt Drill Bit Sets
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