Hornady Single Stage Metallic Presses & Accessories Lnl Press Conversion BushingSimply 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.