Standard Base for Case Trimmer, 5-3/8″ Standard replacement and two optional bases are available for the Original, and Classic Case Trimmers, all made with the sturdy, uniquely Forster design. Short Base for Case Trimmer, 4-5/8″ Required for trimming 9mm Luger or shorter. Long Base for Case Trimmer, 6-1/2″ Case Trimmer Base, long 6-1/2″ length, required for outside neck turning long cartridges and for hollow pointing long cartridges. NOTE: 1/2″ (.500″) of adjustment is built into the Original, and Classic Case Trimmers. This allows the trimmer’s capacity to be widened before the Long Case Trimmer Base becomes necessary. To widen the Original, trimmer base and take advantage of its wider capacity, simply move out both the bearing and housing by 1/4″.