Making custom bong - hole drilling

Discussion in 'DIY and Homemade' started by br00k3ashl3y, Nov 22, 2014.

  1. Hello!
    I am trying to make custom bongs for my friends and I.
    I bought a 1/2in diamond shaped drill bit, but I am unsure of what size downstem to get?
    I'm thinking 14mm, but I'm not sure.
    Any suggestions?
    Should I buy a bigger drill bit?


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