Must be used after Case Trimming. Unique design cuts fast without chatter. One turn does the job. Chamfers and deburrs inside and outside of case necks. Can also be used to remove the crimp from primer pockets of G.I. brass. Works better than tools costing several times as much. Chamfers and deburrs inside and outside of case necks. Must be used after case trimming and can also be used to remove the crimp from primer pockets of G.I. brass.