Hornady New Dimension I Two-Die Rifle Set 6.5 Creedmoor 546289 is an advanced two-die set for bottleneck rifles that incorporates several key design elements that make them function and easy to use. Hornady patented the "hornady unique" bullet seating system that performs benchrest level accuracy and precision. Full-length size dies feature a "zip spindle" design - a spindle and spindle collet are cut with light threads that eliminate slippage and allow incremental adjustments. The spindle has wrench flats where the locking screw would normally contact the threads, eliminating damage from pliers. Smaller pin size dies feature a "keyslot" threading on the spindle and spindle collet that allows for a "keyslot" of extra crimping. Yet they all feature a "nose bleed" chamber that is designed to eliminate case stretch during firing. Hornady Two Die Sets for 6.5 Creedmoor 546289 incorporate the patented "hornady seater" design that ensures smooth easy functioning and eliminates case damage from firing pin shears. The design features an "egg cuff" cut on the spindle where the tang and the seating stem mate. There is a "sure grip" where the sleeve and the seating stem meet. This virtually eliminates any variation in seating depth with a "sure grip" on the spindle and spindle collet.