The Lee Precision carbide factory crimp die is designed to give reloaders the perfect crimp on each round of reloaded ammunition. The factory crimp die crimps the bullet more firmly in place than any other die with more uniform pressure. The carbide factory crimp die features a carbide ring that sizes the cartridge while it is being crimped so every round will positively chamber freely with factory-like dependability. The adjusting screw quickly and easily sets the desired amount of crimp while a factory-like crimp is added to more firmly hold the bullet in place. Lee testing has shown that using a factory crimp die provides a more uniform pressure curve, increasing the accuracy of any bullet. A firm crimp is essential for dependable and accurate ammunition. Specifications: - cartridge: 40 S&W/10mm auto - number of dies: 1 - die type: factory crimp - threads: 7/8 inch -14 - shellholder included: no - storage box included: yes