This CRL Glass Door Lock with Indicator is an attractive and practical way to add security and privacy wherever 5/16" to 1/2" (8 to 12 mm) glass doors are used in glass-to-wall or 180º glass-to-glass 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 Receiver, used for glass-to-glass installations, come with gaskets and hex wrench. Installation and glass fabrication instructions included.