Pro-Lok INJIG-MORT Mortise Lock Installation Jig - Deep Lock Mortiser This Fixture Uses Unique, Quick Change Cutters Which Allow The Cutters To Be Changed In Seconds Without Removing The Fixture From The Door. The Mortise Hole Is Automatically Centered On The Door And Accurate Results Are Obtained Every Time Cuts A Lock Mortise Into Aluminum And Wooden Doors In Under 5 Minutes