Durable Material -- The swing bar door guard is made of high quality zinc alloy, with black finshed, wear resistant, not easy to rust and deform, durable and sturdy. Thickened design makes it more strong and durable which can resist up to 200 lbs force. Unique Locking Design -- Equipped with precision steel balls on the rotating shaft, it can hold locking arm steadily for extra security. Adjust it to the position of the third gear for more smoothly opened and closed. Home Security & Childproof -- The swing bar door lock is a security locking device that provides privacy and security for guests and residents, allowing to open the door from inside few inches for ventilation or identification, proventing break-in. It also can provide child-safe door security when install it out of children's reach. Easy to Install -- Package comes with mounting screws, easy and convenient to install in several minutes. Please ensure your door is flush with door jamb. - Product Name: Swing Bar Door Lock - Material: Zinc Alloy - Size: 105mm x 63mm/4.13" x 2.48" - Color: Black Package Includes1 Pc x Door Lock Latch 7 Pcs x Screws.