FUNCTION: The door handles feature a rotary knob on one side for internal door locking and a safety release mechanism on the other side. The door can be locked and unlocked from the inside with a simple turn of the knob. These handles are designed for interior doors, providing security and privacy. DURABLE DESIGN: Constructed for strength and durability, these door handles offer a solid build that resists rattling and breakage commonly found in lower-quality mortise door handles. The polished brass finish provides a sleek and elegant appearance suitable for home or office environments. SAFETY: The exterior side of the door knob includes a safety mechanism. In an emergency, the door can be quickly and safely unlocked from the outside using the included override key. This function is intended for emergency use only and is not compatible with standard lock and unlock keys. APPLICATION: Suitable for interior doors with a thickness ranging from 35mm to 45mm. The tubular latch is adjustable to fit 60mm or 70mm backset (distance from the center of the bore hole to the edge of the door). Ideal for both residential and commercial applications. INSTALLATION: These door handles come with installation instructions and templates for easy setup. All necessary mounting hardware is included, such as color-matched screws, a tubular latch, and an override key. The handle set is reversible and can be installed on both left-handed and right-handed doors.