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Originally Posted by madtownidiot
The only thing for drilling through metal are diamond or carbide bits and hole saws. Make sure it's carbide or diamond tipped or you'll just end up extremely frustrated. Start with a small bit, as in 1/8, as a guide for the 7/8 hole saw.
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This is a little off-topic, but the statement "The only thing for drilling through metal are diamond or carbide bits" is incorrect. Twist drills are specifically made for drilling through metal. Would I use a 7/8" twist drill on a case? Probably not but if you sandwich and clamp the side between two pieces of wood it would work.