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Large Hole, Thru-Hole, and Tunnel Boring Bits

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Tunnel Boring or Thru-hole bits are large diameter hammer drill bits designed to be used in horizontal applications where the bit will travel completely through the material being drilled. They have specialized fluting to aid in chip removal as the bit travels. With a better than average usable depth, these bits are often a good option for those who have no need of desire to get into the complicated world of diamond core bits.