The Hornady Lock-N-Load Press Conversion Bushing enables you to use Hornady's innovative Lock-N-Load system with your existing reloading press. Simply thread this conversion kit into your RCBS Rock Chucker or other compatible reloading press using the standard 1 1/4"-12 thread.Hornady Lock-N-Load Press Conversion BushingCompatible with RCBS Rock Chucker and other presses with 1 1/4"-12 threadEnables use of Hornady Lock-N-Load technology on competitor pressesEasy installation and conversion processMaximizes efficiency of your existing reloading setupThis conversion bushing is the easiest way to upgrade your reloading press and take advantage of Hornady's Lock-N-Load technology allowing you to get the most out of your reloading equipment regardless of the original manufacturer.