in case you don't know, the hose ends from binghams are not parrallel they are slightly hourglass shaped, that helps hold the plugs in the hose..I don't know the size, mine are in hoses.. I have a set of parrallel plugs I bought from a Trad Gang Member and they mic out at 1.65 inches or 42 mm . I havn't used them and plan to put the in a spare hose I just got.