The High Security Door Chain is made of high-quality stainless steel with a fine brushed surface. It features a simple geometric design with rounded spherical hinge points and a smooth zipper structure. The main body is 85mm long, the base is 63mm high, and the width is 22mm. The lock part measures 56mm × 33mm. Through its sturdy chain connection and movable buckle design, it can achieve safe observation and ventilation without opening the door, effectively preventing external force intrusion and improving the security level of the door lock system.