What's a Parabolic Drill Bit? What are Worm Pattern Drill Bits Used For?

Thanks. I think that is what I have but they must be NOS as I can't find any info.
 
Deep holes in materials that produce difficult chips when drilled, it is often possible peck more then one diameter depending on the material and set up of course, 6061 aluminum is an excellent candidate for that geometry. They also work well in plastics.
 
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