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    Hello, I m drilling out port holes in an ID Fan. The hole are for sensing lines so my instruments can read the differentil pressure in the ID fan. the material i am drilling is as hard as concrete (built up gunk from the ID fan) i need a bit that is about 3 - 4 feet long and about 1/2" in diameter. can you help?
    - Tim


    Try our Carbide Tipped for Masonry Stone, Brick, and Concrete. These are carbide tipped bits for masonry and concrete on a long flexible shaft.
    - John
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