These enhanced toolheads made by On Point MFG, LLC are designed to be stronger and more capable than the factory Dillon toolheads. Machined in the USA out of high quality steel, these have more material and better geometry to reduce bending and fatigue. Adjustable front alignment pin ensures the shellplate is aligned before dies touch taller cases. Adjustable casefeed cam is closer to the slide to reduce the chance of bending the roller bolt, and lets you fine-tune the casefeed plunger for perfect operation. The priming-station hole is threaded, unlike factory toolheads, for even more versatility.