Lee Precision Smart Lock Breech Lock Bushing Features The Lee Smart Lock Breech Lock Bushings eliminate the need for a traditional lock ring on each die instead using a quick change bushing system that threads directly onto the die body. The easy grip splined drive surface allows for fast accurate installation and removal of dies from the press which is especially useful for reloaders who regularly switch between multiple calibers or die configurations. An internal o-ring holds each bushing s adjustment in place permanently once it is set meaning a die s precise height setting is preserved even after the die is removed and swapped back in later. This eliminates the frustration of resetting die height every time a caliber change is made. Sold in a 4 pack this quantity allows reloaders to outfit several dies at once with the Smart Lock system making caliber changes across a reloading session fast and consistent. Lee also offers an optional lock ring wrench to make installation of these bushings onto dies even easier when first setting up the system. This bushing design reflects Lee s broader focus on affordable practical solutions that simplify the reloading process for hobbyists and high volume reloaders alike. For anyone who reloads multiple calibers on the same press these Lee Smart Lock bushings are a time saving upgrade over standard lock rings. Lee Precision Smart Lock Breech Lock Bushing Specifications Manufacturer: Lee Precision Model: Smart Lock Breech Lock Bushing Type: Reloading Press Parts Quantity: 4 Available At: GrabAGun