The Doubla Alpha Mr. Bulletfeeder Bullet Dropper Thread-Extention is designed to allow the Mr. Bulletfeeder dropper to be mounted higher above the toolhead for reloading very long cases like the 30-06 and 300 WinMag. Should you need to lift the bullet dropper higher than the threads in the toolhead allow - thread this extension in first. Turn it down by hand to lock it against the top of the tool head, and then thread the Mr. Bulletfeeder dropper die into it. This will position the Dropper higher, solving the problem with those very long bullets.