Privacy Function: Privacy door hardware features a locking mechanism on the interior. The exterior side features a small pin hole to unlock the door hardware from the outside in case of an emergency. Use: Non-Keyed door Lock for use on bedroom and bathroom or on doors where locking is needed. Adjustable: Designed for standard preparation sliding pocket doors between 1-3/8" and 1-3/4" thick. Handling: Universal handing, can be used for left or right handed applications. Waranty: Covered under a limited lifetime mechanical and finish warranty. Our privacy door knob sets are locked from the interior using a thumbturn lock on the interior handle with a coin turn on the exterior handle to unlock the handle from the outside in any case of emergency. Privacy knobs are ideal for bathrooms, bedrooms, or anywhere a locking door is desired but a keyed cylinder isn't necessary.