D DiamondJim420 Well-Known Member Joined Feb 24, 2012 Messages 187 Reaction score 19 Jun 24, 2012 #1 I'm looking at a Roor Icemaster bong. 5mm thick, 18" tall. The joint size is either 14.4mm or 18.8mm. What choice would you make here? (this bong will be for personal use for me and my wife only).