Keyed Deadbolt for Storm and Screen Doors: The GLK deadbolt lock adds a layer of secondary security to storm and screen doors. It’s ideal for exterior doors where a keyed lock and deadbolt are needed for peace of mind. Compatible with Other Lever Handles: Matches Ideal Security’s GL and AJ Series handles for a coordinated look, but also works as a standalone upgrade. Installs above or below most out-swinging storm door handles, with a keyed cylinder outside and thumb turn inside. Fits Most Storm Doors: Suitable for doors 1 to 2-1/8 inches thick. Includes a spindle that can be trimmed to fit your door thickness. Compatible with standard installation spacing. Straightforward Installation: Requires three 5/16-inch holes to be drilled through the door for the screws and spindle. Installation template is available to help guide the process. Set Includes: Includes exterior key cylinder escutcheon, interior deadbolt with thumb turn, screws and spindle for doors from 1 to 2-1/8 inches thick, surface-mount strike plate, two deadbolt shims, and two keys.