Represents the finest in machined craftsmanship, giving you one full-length sizing die and one standard seating die in a single package. The Zip Spindle design on these Hornady reloading tools positively lock to eliminate slippage, using a series of light threads cut on both the spindle and spindle collet. The internal die profile of the Hornady .50 Cal BMG Sizing & Seating Die 2pc Set is precision machined and polished to a smooth finish that delivers reliable functioning without case sticking