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you have to drill stainless at lower speed and used lube. I have a large pile of burn up bits that I have used on stainless.
Most of the Cobras I see are done in aluminum.
Aluminum will cool quicker than stainless. I would go with the aluminum, no real downside.
Dwight
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''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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