The RCBS 3-Die Roll Crimp Set is designed specifically for popular straight-wall pistol cartridges, providing a reliable solution for your reloading needs. This die set includes a steel Sizer Die, Expander Die and Roll Crimp Seat Die. The Sizer Die requires case lubrication to ensure smooth and precise resizing. The Expander Die expands the case to the correct diameter, allowing for a perfect fit for your bullet. The Roll Crimp Seat Die not only seats the bullet firmly in the case but also roll crimps it to prevent movement during recoil, ensuring greater stability and accuracy with each shot. Ideal for reloaders seeking top-quality performance and consistency.