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.

By adding both a premium Carbide Expander Assembly and a Neck Sizing Die, Lyman has created two die sets in one. Neck sizing eliminates overworking the brass, extending case life.  Lyman Carbide 3-Die Sets include:

• Deluxe Carbide Expander Assembly, with a free floating carbide sizing button, which smooths neck expansion by moving the button up the decapping rod to better use the press’ leverage. It eliminates the need for inside neck lube. 
• Neck Sizing Die, which allows the case to retain the precise chamber dimensions of the individual rifle while avoiding excessive working of the brass.
• Standard Full Length Sizing Die, for taking brass down to factory dimensions.
• Standard Bullet Seating Die

*Works with Dillon Precision and Mark 7 Reloaders and Presses