The 3-part oil nail with screw threads from 'Black Leaf' can be attached to a heating coil 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.