The Lyman Carbide Deluxe Rifle 3 Piece Die Set adds both premium Carbide Expander Assembly and a Neck Sizing Diet to create two die sets in one. Neck sizing eliminates overworking the brass, extending the case life. Deluxe Carbine Expander Assembly, with a free floating carbide sizing button, smooths neck expansion by moving the button up the decapping rod to better use the press’ leverage and eliminates the need for inside neck lube. The Neck Sizing Die allows the case to retain the precise chamber dimensions of the individual rifle while avoiding excessive working of the brass.