Trims most standard calibers from 0.171" to 0.459" - fits from 5.7 x 28 all the way to 45-70; Includes both coarse and fine trim length adjustments that will maintain 0.001" repeatability; 0.490" diameter Cutter Shaft (17 cal. Cutter Shaft required for 17 cal.); 5-3/8" long Base; Accommodates all six case trimmer accessories; Plus, Forster manufactures the only Case Trimmer that holds the case in a Brown & Sharpe-type collet - keeping your trimming depth consistent, even when the rim diameter varies; The Original Case Trimmer requires a Collet and Pilot for each case, ordered separately; Collets #1 through #4 are compatible with the Original Case Trimmer