Designed for the RCBS MatchMaster Precision Power Case Trimmer, these 3-Way Cutter Heads come set up and ready for the caliber of your choice. Trim, deburr, and chamfer with adjustable carbide blades and the included pilot. Machined to the highest standards from 416 stainless steel and custom finished for durability. Note: For use with RCBS MatchMaster Precision Power Case Timmer Only. Will not fit other RCBS trimmers.