This is an insert for your tube / hollow body mold so you can change the thickness of the head for a tube jig or thick for a t-rig.
The insert screws into the spline and determines how hollow the tube is. The spline is what makes the tail.
When checking out please document in the notes what tube this is for and what type of head you want. Give us a call if you aren't sure.
95199, 95200, 95201, 95202, 95203, 95204, 95205, 95206, 95207