The Zip Spindle design on all full length size dies positively locks to eliminate slippage. A series of light threads cut on both the spindle and spindle collet allows you to make incremental adjustments by turning the spindle or you can easily zip it up or down for larger movements. An internal die profile is precision machined and polished to a smooth finish that delivers reliable functioning without case sticking or excessive friction. The Hornady Sure Loc lock rings clamp around the entire die applying constant pressure across the threads to hold the ring in place. The locking screw tightens the ring without ever coming into contact with the threads, eliminating possible damage from pliers. Superior to ball expanders, this Hornady exclusive provides extremely smooth neck sizing and significantly reduces friction and case neck stretch. Internal threading prevents it from pulling loose and the elliptical expander also eliminates the need for a separate expander die for necking up to the next caliber. A seater adjustment screw easily adjusts for bullet seating depths. The locking retainer spring removes in seconds for easy disassembly and cleaning of the die. The seating system holds the bullet, the case neck, and the seating stem in perfect alignment. The system includes a floating bullet alignment sleeve, a floating steel seating stem and a built in crimper for benchrest precision. Bullets are aligned in the sleeve as they enter the die for optimum seating and enhanced accuracy. The built in crimper gives a option of crimping without the need for an extra crimp die thus saving a station on the press.