Hey Decided to make a homemade bong out of a wine bottle (nice one). Haven't made one myself before. So I wanted to order a nice downstem. Got a question. What's diameter of 6 Arm downstem? $12.95 - 6 Arm Downstem with 12 diffusion slits fo water pipes | Need the diameter so I buy a diamond drill bit with right size. Thanks
18.8mm/19mm ... Im pretty sure thats what you asking . Thats the joint size. Maybe im wrong though....