Fancy making your own tip or converting a pipe stem.
 
These inserts allow you to drill a 6mm hole into your chosen part and press fit these in and your ready to vape. 
 
The exposed part of the tip is 17mm long with a 4mm internal bore.
 
Please be aware these are slightly wider than 6mm for a tight grip. I would recommend testing one on a spare bit of material before fitting to your work to avoid any issues.
 
Pack includes: 3x Stainless Steel Inserts and O rings