Lee 40 S&W 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 .840 to .850 inches. Size .40 Type Case Length Gauge w/Shell Holder Series with Shell Holder Weight 0.05 lbs Caliber 40 S&W Function Gauge/Holds Case Includes Shell Holder Material Steel Quantity 2 Piece Media Type Brass Shell Media Capacity 1 Shell Compatible With Cutter/Lock Stud