The Lee Custom Over-Run Bullet Sizer & Punch is a versatile tool designed to size cast bullets with precision. It not only sizes bullets but also seats and crimps gas checks, ensuring optimal performance and consistency for your reloading process. To use this product, it should be paired with the Breech Lock Bullet Sizer Kit, making it compatible with any Breech Lock-enabled reloading press. Please note, Lee Liquid Alox, a reloading press and the Breech Lock Loading Kit are required for full functionality of the system, though each is sold separately. This combination of high-quality components delivers reliable results for reloaders seeking both precision and ease of use.