This 3-Die Carbide Roll Crimp Set for straight cases consists of a carbide Sizer Die, an Expander Die and a Seater Die.
The Carbide Sizer Die has a carbide ring that eliminates the need for lubing the case that needs to be sized. This Die also removes the primer.
You widen the case to the correct bullet size wit the Expander Die and also flare the edge to feed the bullet more easily.
Last one of this 3-Die Carbide Roll Crimp Set is the Seater Die that pushes the bullet in place and fixates it with a taper crimp.
The 9 mm variant is suitable for 9×19 mm, 9×21 mm and 9×23 mm.