The Lyman Was The Originator Of The Tungsten Carbide (T-C) Sizing Die And "Multi" Concept With The Addition Of Extra Seating screws For Pistol Die sets. Combined With Another Lyman Original - The Two Step Neck Expanding Die, Lyman .45 Colt Carbide 3 Die Set offers features Like a One Piece Hardened Steel Decapping Rod And Extra Seating screws For All Popular Bullet Nose shapes And All Steel Construction.