1High Quality Material: Door exit button is made of high quality stainless steel material, rustproof, high hardness, sturdy and durable. 2Installation: The size of door release button is approx. 86x86mm/3.39x3.39in. Suitable for installation on hollow door frame and embedded electrical box. 3Professional Design: Professional manufacturing, exquisite workmanship, brushed treatment, comfortable hand feeling, have a long service time. 4Easy Operation: Easy to operate, push the button to instantly open the door, convenient for using, save your time and energy. 5Wide Application: Door release exit button is widely used in access control system, such as office, bank, gas station, department store, etc.