CRL Sliding Glass Door Lock With Indicator is an attractive and practical way to add security and privacy wherever 5/16 to 1/2 inch (8 to 12 millimeters) glass sliding doors are installed. This Lock can accommodate glass-to-wall inline installations. A turn of the thumbturn on the interior side of the Lock changes the color of the exterior indicator. Emergency access is made possible by a low profile screw on the exterior face. The Lock comes with a wall mounted strike plate, screws, and anchors. Both Lock and Keeper come with gaskets and hex wrench. NOTE: Glass must be notched for installation of Lock and Keeper.