Switch back to the hole saw for the next inch, then hog out that next inch. Use it to hog out the inside of the tube you just made. Make the tube about an inch deep, then pull it out. You can expect a much shorter service life than a carbide bit, but there are instances when they may prove to be more econimical. First, you start the tube with the hole saw bit, say at 1.5' size. All steel – Good for concrete and very soft rock applications or occasional to rare usage.I cut 2-foot deep holes in Tennessee bedrock and it made short work of it. Speed-X SDS-MAX masonry/concrete drilling bits not 1 Home Improvement Retailer. ![]()
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