simple the measurements are i believe for outside diameter so just get a cm ruler remember each little line is 1mm so in 1cm theres 10 little lines simple enough....most bongs female downstems are 12mm while the male slide is 9mm..but in your position just measure the inside of the rubber grommit side to side or up and down dont matter if its like 13 or 11 then u just need a 12mm downstem and 9mm male bowl.remember rubber will stretch to fit...simple really man hope i helped and good luck post pics if u can
one.stoned.wookie Reviewed by one.stoned.wookie on . How to measure slide for bong I just recieved a nice bong from a friend for my birthday, problem is, there is not female or male slide/head. I want to order the new stem and head online, and see various sizes (9mm,12mm,and 16mm). Just wonder where to measure to figure out what size i need. Its a 1 foot bong, that is very thick. Oh, and it has the rubber piece in the hole where the stem would go, do i take that out if i measure the diameter of the whole or measure it with it in? Sorry for the questions, Any help is much Rating: 5