Durable Material: The interior door knob lock is made of durable and reliable copper material, high strength and wear-resistant, and will not easily rust after prolonged use. Double-Sided Design: The door knob lock is suitable for double-sided door security, such as in hallways, ensuring high security for your door and room. Invisible Design: The keyed entry door knob lock has an invisible design, which does not affect the appearance of the door panel and keeps the door surface beautiful and clean. Easy to Install: The keyed entry door knob lock is convenient and time-saving to install; it does not require many tools or complicated steps. Multifunctional Use: The keyed door knob lock is suitable for back walls, interior doors, and other locations where a lock is needed, and has flexible and varied applications.