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Old 03-30-2011, 11:50 AM   #16
Join Date: Dec 2008
Location: NW Chicago burbs
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black oxide vs bronze oxide drill bits

I agree. Just don't know if I would accept just this web site. I used to have a library of tooling catalogs and reference material. Here is some stuff off PTD's website. Probably more drilling info than anyone should be subjected to. They talk a little about "bronze" arround page 10. They list it as a surface treatment resulting in a bronze color. A coating would then go over the surface treatment.

Here is more. I used to read this stuff like people read great lierature.
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