Stainless Steel 3-Layer Wire Drawing:The anti-theft chain door lock is made of stainless steel, sturdy and durable, not easy to fade, and corrosion-resistant. It can ensure your safety and have a long service life. The three-layer wire drawing can resist daily scratches, corrosion and rust, and prevent collisions and kicks. . Safety Lock Device:There is a button with a spring anti-theft button. The chain can be opened by pressing the seat belt buckle, which can effectively prevent outsiders from reaching into the inner hook and falling off the chain. This design allows your chain to fall and protect the house more tightly. . Thick Chain Design:The tight chain twist welding combination is durable, not easy to break, and can be used for a long time. Compared with ordinary chains, our chains can provide you with safer protection and make you and your family more at ease. . Easy to Install:Contains a silver anti-theft chain and four screws. With this thing, you can fix them behind the door without additional screws. Chains can be used for wooden or metal doors on various types of doors, and can be placed above or beside the door frame. Surface mounting and narrow design make this door chain easy to install on any door size\/thin or narrow frame. . Anti-Theft Protection:The anti-theft door chain provides additional protection based on door locks and latches, which can effectively avoid the intrusion of thieves and strangers, and is very suitable for people living alone. It can also prevent children from leaving the home without permission, thereby providing additional child safety gate security protection. .