Installing the stainless steel fire door sequence automatic door closer spring is straightforward and user-friendly. Simply attach the device to the door and frame using the provided hardware. Once installed, the door closer spring will automatically engage when the door is opened, ensuring a smooth and controlled closing action. This feature is particularly useful in high-traffic areas where doors are frequently used, as it helps to maintain security and prevent unauthorized access. Features -Color:Silver -Material:Stainless Steel -Size:28.30X8.80X1.20cm/11.12X3.46X0.47in -Convenient automation: experience the ease of automatic door opening and closing, making daily operations and userfriendly -Coordinated closure: the door coordinator ensures that double doors close in the correct order, enhancing security and functionality -Quiet performance: the spring mechanism allows for a quiet and smooth door closing, minimizing disturbances and maintaining a peaceful environment -Fireresistant: designed with fire safety in mind, this door closer helps protect against fire hazards, ensuring safety in critical situations -Wide compatibility: this door closer is compatible with a variety of door types, making it a versatile choice for different applications Package list: 1 door Closer 2 x screws