Perko Mortise Lock SetThis Mortise lock set from Perko is made from chrome plated zinc alloy. It locks by turning bottom from inside or key from outside. The bevel can be reversed during installation.Specifications: Door thickness: 1" - 1-3/8"; Case dimensions: 2-3/4" x 2"; Escutcheon dimensions: 4-3/8" x 1-1/4"; Screw Size: #6; Click for Perko Mortise Lock Set installation instructions.