Forster's "Classic" Trimmer is a larger version of the Original Forster Trimmer, and it is sized for trimming big bore cartridges for popular big game rifles and classic black powder calibers. The cutter shaft is larger than the Original Trimmer (.522" diameter) and the mounting base is 6A 1/2" long. The Classic will accommodate cases from 17/8" long through 41/8" long with case mouths up to A 1/2" diameter, shorter big bore cases can be trimmed by substituting the shorter base from the Original Trimmer (FCTB101) for the longer Classic base. Collets FCT2005 though FCT2008 fit the Classic Trimmer, order collets and caliber specific trimmer p Mfg: Forster Products, Inc.