This Forster Case Trimmer Kit (w/6 Pilots & 3 Collets) is the original, which comes with six pilots, including 22, 24, 25, 27, 28, and 30, as well as three collets of 1, 2, and 3. For most calibers with bullet dimensions ranging from 0.171 to 0.459 inches, this is ideal. The kit boasts a premium shell holder design as well. Collets 1 through 4 fit the original case trimmer while holding rims of most pistol and rifle calibers in that very range. This kit is an excellent choice for expanding on an existing reloading system.