RCBS .350 Legend 3-Die Roll Crimp Set - RCBS pioneered and developed the 3 Die Sets for straight wall rifle and pistol cases. In the 3 Die Set sizing and expanding (belling) are done in separate dies. The 3 Die Set has a Sizer Die with Decapping Unit, Expander Die for expanding and belling the case mouth and a Seater Die with Bullet Seater Plug(s) for seating and crimping the bullet. Manufacturers Number 21904 Sizing/Decapping Die Expanding/Belling Die Seating/ Roll Crimp Die Instructions Warranty card Plastic Storage Case