The Lee 40 S&W, 10mm Auto Pistol Breech Lock 4-Die Set is a complete reloading kit designed for both 40 S&W and 10mm Auto cartridges. This set includes colored Smart Lock bushings for easy die identification and quick die changes. The set features a Carbide Full-Length Sizing Die, Powder Through Expanding Die, Bullet Seating Die and Carbide Factory Crimp Die, providing all the essential tools needed for resizing, expanding, seating and crimping your ammunition. Additionally, the kit includes a Universal Shell Holder, Powder Dipper and detailed Instructions/Load Data for both the 40 S&W and 10mm Auto. This die set is ideal for reloaders working with mixed range brass and is compatible with presses that have the Breech Lock Quick Change feature, ensuring fast and precise die changes without losing your settings. The Lee 40 S&W | 10mm Auto Pistol Breech Lock 4-Die Set is an excellent choice for reloaders seeking efficiency and reliability.