Aluminum alloy body: made of aluminum alloy, anti-corrosion and ; High-strength elasticity: built-in high-strength spring, strong tension and good durability; Adjustable closing speed, clockwise increases cushioning, counterclockwise increases closing speed Simple and lightweight, the door closer automatically closes the end buffer, positioned at any angle within 100°, and the door closing buffer avoids damage caused by collision General purpose fire rated doors adjustable for all types of medium sized doors - left and right swing doors, wood and metal doors, residential and commercial doors, exterior/interior closers, fire doors, Manufacturer: DMETE