The RCBS Carbide 3-Die Set with Taper Crimp is made from polished and heat-treated steel. Includes a Sizer Die with Decapping Unit, Expander Die for expanding and belling the case mouth, and a Seater Die for seating and crimping the bullet - straight wall cases will roll crimp, unless the description indicates it ahs a taper crimp. No sizing lube is needed with these carbide dies. Shellholder sold separately. For use with 9mm Luger.