Crafted from polished and heat-treated steel, the RCBS Carbide 3-Die Set offers exceptional reliability and performance for reloading enthusiasts. The set includes a Sizer Die with Decapping Unit, an Expander Die for expanding and belling the case mouth, and a Seater Die for seating and crimping the bullet (note: straight wall cases will roll crimp unless otherwise specified). Thanks to the carbide construction, no sizing lube is required, making these dies convenient and easy to use.