Perko Mortise Latch SetThis Mortise latch set from Perko is chrome plated zinc alloy. It has a turn button lock, with a bevel that can be reversed during installation.Specifications: For door thickness: 1" - 1-3/8"; Case dimensions 2-1/4" x 1-13/16"; Escutcheon dimensions: 4-3/8" x 1-1/4"; Screw Size: #6; Click here for Perko Mortise Latch Set installation instructions.