After a case has been loaded a few times, it will stretch beyond maximum length and must be trimmed. The Cutter and Lock Stud works for nearly all calibers. You will need only one. The Case Length Gauge (Pilot) and Shell Holder must be ordered as Case Length Gauge and Shell Holder for each caliber. Trim cases by hand or use with an electric drill to trim, chamfer and polish cases faster. Eliminates danger of long cases. Squares the mouth for more accurate bullet seating and exit. You also need the appropriate Case Length Gauge & Shell Holder."

Works on all brass less than .475 base diameter. If you are looking for trimming cases with a base diameter larger than .475, you will need the large cutter and lock stud.