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    What Size/Type Diamond Drill Bit and Grommet Will I need For HomeMade Glass Bong

    I am making a glass coke bottle bong, because I believe it is bad for me to be smoking from a gatorade bottle with a hose pipe. I have a 15mm diameter stem, and want to know what size diamond drill bit I will need and what size grommet I will need, thanks.:eyesmoke:
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    What Size/Type Diamond Drill Bit and Grommet Will I need For HomeMade Glass Bong

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