Super Simplex Die Set for 40 S&W (3 Die Set) (4440010)Super Simplex dies reload pisol and revolver cartridges in three operations: Full length resize and decapping die return the case to original dimentions. Stepped expander die to expand the case mouth in such a way as to accept cast or jacketed bullets without tipping or shaving. Bullet seating die which can be set to roll crimp if required. Each set comes with the extra seating screws necessary for the popular projectiles used with the cartridge.