Paraphernalia question about buying a piece

[kushblowin]

im looking for a bong that i can do dabs out of too. i found one and it says it has a 18.8mm female on it and i cant find a quartz banger that size only 18mm. does the 18mm work or is that the wrong size?

 

[ChipTrippyFox]

I've never heard of an 18.8 size personally.

That being said.. don't mix smoking and dabbing from the same bong. The smoke resin completely ruins the taste of the dab. Yuck