The Hornady Lock-N-Load Die Bushing is a great way to get the most out of your Lock-N-Load press. Simply thread a Hornady® Lock-N-Load® Conversion Kit into your RCBS® Rock Chucker or other reloading press using a 1¼”-12 thread, and you’re ready to start using the Lock-N-Load® System. It’s the easiest way to get the most out of your reloading press. These bushings let you take advantage of Hornady’s® Lock-N-Load® technology even if you own a competitors reloading press.