【Steel Material and Wire Drawing Process】: The anti-theft chain door lock is made of stainless steel, which is sturdy and durable, not easy to fade, and corrosion-resistant. It can guarantee your safety and have a long service life. The three-layer wire drawing treatment on the surface is resistant to daily scratches and prevents collisions and kicks. 【Safety Lock】: There is a button with a spring-loaded anti-theft button. The chain can be opened by pressing the buckle, which effectively prevents outsiders from reaching the inner hook and falling off the chain. This design will release your chain and protect the house more tightly, making your house safer. 【Thick Chain Design】: The 3mm thicker chain is durable, not easy to break, and will not break easily when pulled hard. It can be used for a long time. Compared with traditional chains, our chains can provide you with safer protection and give you and your family more security. 【Easy to Install】: The chains can be used on wooden or metal doors of all door types and can be placed above or next to the door frame. (The greater the distance between the buckle seat and the base, the smaller the opening angle) 【Anti-theft Protection】: The safety door chain provides additional protection based on door locks and latches, which can effectively prevent the intrusion of thieves and strangers, which is very suitable for people living alone. It can also prevent unauthorized children from leaving the house, providing additional protection for children's safety.