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They have a lot of automotive uses; if you are faced with creating an opening in a metal panel, say a bulkhead, for a wire/cable or tube to pass thru something like a firewall or bulkhead, drills tend to "pull" on the metal, distorting it, which often requires going to a hammer and dolly to beat it flat so that a cable gland can seal it weather tight again. Rotary broach tools cut a flat, undistorted opening of whatever size is required in a single move, just run a deburring tool around the hole and install the cable gland and you are ready to make a weather tight pass thru with minimal time and efffort.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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