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What size drill bit do I need?


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#1
Provolownage

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I'm looking into making myself a new bong. I already have a vase, but nothing else.
Correct me if I'm wrong:
I'll need a drill bit to make a hole for the female downstem to fall through the grommet, and a slider for the bowl.

What size drill do I need to make a 12mm hole ( I that's how small the female downstems come, right?) and how much should everything including the 9mm slider and grommet cost?

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#2
kyle944811

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You'll need a drill bit made to drill glass, not just a regular bit. Not sure about your other questions. Convert from standard to metric and you'll be fine.




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