Privacy door knobs have a latch with a locking mechanism, but no key. They are typically found on the interior door where a locking mechanism is needed for privacy, such as the bedroom doorknob and bathroom doorknob. This clear crystal glass privacy door knob is very easy to install, and all hardware, instructions, and drilling templates are included. You only need a screwdriver to complete it, conveniently and fast. And clear crystal glass combining zinc alloy rosette makes the passage crystal glass door knobs beautiful and durable. At the same time, there is an emergency release hole on the exterior rosette. When an emergency happens, the door can be unlocked from the outside by pushing a hex key (included, comes with the product) through the emergency release hole.