HORNADY LOCK-N-LOAD CLASSIC SONIC COMBO KIT, The Hornady Lock-N-Load Classic Sonic Combo Kit is ideal for the novice reloader to the experienced reloading enthusiasts. This Hornady reloading kit has a unique bushing system that lets you change dies fast and efficiently with a simple flick of the wrist. With Lock-N-Load technology in your Hornady reloading press, you can load one caliber, change dies, and start loading another caliber in seconds. If you load more than one caliber, Lock-N-Load will dramatically speed up your reloading efforts with minimal effort.