RCBS Precision dies are designed to deliver superior performance plus easy adjustment and operation. Sets feature: sizing dies with tolerance twice as stringent as typical firearms and ammunition for consistent chambering round after round. Fine body knurling for easy, non-slip adjustment. Hardened die bodies. Easy, adjustable expander-decapping unit locks in place, eliminating slippage. Three-piece expander/decapping unit lets you replace the decapping pin in a snap. Includes: full-length sizing die and seater die. Shell holders sold separately.