The Lee Custom Over-Run Bullet Sizer & Punch is a precision tool designed to size cast bullets and also seat and crimp gas checks, improving performance and consistency. It is intended for use with the Breech Lock Bullet Sizer Kit and is compatible with any Breech Lock-enabled reloading press. To fully utilize this kit, you will need Lee Liquid Alox, a reloading press and the Breech Lock Loading Kit, each sold separately. This combination ensures an efficient and reliable reloading process, providing high-quality results with every use.