These titanium nails by Black Leaf are for oil use and can be inserted into your connector and the head is adjustable by screw.
For usage, the pin head needs to be heated by a lighter until it glows hot red. It is the titanium material that allows this to heat your oil or concentrate to the optimum temperature. The titan is heat resistant.
These adjustable nails are cut for 18.8mm or 14.5mm joints only.