Lee 357 MAG Case Length Gauge is a precise, easy way to trim to length and square the case mouth. Used with the Cutter and Lock Stud or Zip Trim. Trim to length 1.270 to 1.290 inches. Size .357 Type Case Length Gauge w/Shell Holder Finish Silver Series with Shell Holder Weight 0.07 lbs Caliber 357 Mag Function Measure Cases Includes Shell Holder Material Steel Quantity 2 Media Type Brass Shell Media Capacity 1 Shell Compatible With Cutter/Lock Stud