Lyman Precision Rifle Dies offer unparalleled precision, smoothness and versatility. Each steel die is CNC machined to precise dimensions and consistent tolerances from lot-to-lot. Sizing dies are vented, polished, heat treated for hardness and then polished again to a micro-finish for extra smoothness. Available in 2-die and 3-die sets. Lyman 2-die sets include a seating die with optional roll crimp and full length sizing die with decapping stem and neck expanding button. Lyman 3-die sets are for straight wall cases and easily load both cast and jacketed bullets