For size reference chart see below

• The internal Collet steps ensure that the case head is firmly seated in the Collet, even when there is case rim diameter variation, unlike one-size-fits-all universal chuckheads or multi-piece shell holders.
• The tapered design ensures that the Collet securely closes on the case rim without pulling the case back. When you lock a case into one of our Case Trimmers, it stays exactly where you put it.
• All Collets may be purchased individually. Several common sizes may be ordered in kit form, along with a selection of Pilots, with the Original and Classic Case Trimmers Kits.

Collets #1 – #4 are designed for use only with Original and Power Case Trimmers. Note that they are not interchangeable with Classic Case Trimmer Collets.