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.  The drilling of such holes generally requires the use of an Extra Length Drill.  The drills are made with a general purpose flute design which will perform satisfactorily under the widest range of operating conditions and materials.Because of the inaccessibility or the extreme depth of a hole, it is found that even long series drills are not long enough.

1-1/2-6,HSS Bottoming Tap H-4 They are for general use in production tapping or hand operations in a wide range of application material groups..

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Broach cutting using Drillco cutters means you can produce large diameter holes efficiently and quickly with less energy, faster penetration and less thrust.  Rather than drilling out the metal with a solid drill, Drillco cutters remove only the periphery of the hole, ejecting a slug at the end of the cut..

  Rather than drilling out the metal with a solid drill, Drillco cutters remove only the periphery of the hole, ejecting a slug at the end of the cut.Broach cutting using Drillco cutters means you can produce large diameter holes efficiently and quickly with less energy, faster penetration and less thrust..