The 3-part oil nail with screw threads from 'Black Leaf' can be attached to a heating coil with 16mm inner diameter so that the nail can be comfortably evenly heated. The risk of accidentally heating the bong's standard grinding is lower. Naturally, you can alternatively heat the nail with a torch. The domeless nail can be used for bongs with SG 10/14/19 male+female. Titanium is neutral in taste, resists the high temperatures and is not easily deformed.