This tool can also be used to expand up to a larger caliber; great for the Wildcatters.
To remove the DREADED DOUGH-NUT, adjust the bottom screw to stop the NECK EXPANSION just short of the DOUGH-NUT.
Then the neck is the correct size for the K & M FLUTED CARBIDE neck turner pilot to remove said Dough-Nut.
Mandrels are available in cal. .17, .19, .20, .22, 6mm, .25, 6.5mm, .270, 7mm, .30, and .338.
Each Mandrel has an adjustment screw to bottom-out in the Brass before the case mouth can hit the mandrel's shoulder.