High quality material It is made of aluminum alloy, chrome plated, anti-rust, sturdy and durable. The bracket is made of chrome plastic, which can avoid the sound of metal friction and has a long service life. 150*53mm Adjustable Our door closer can adjust the spring tension by adjusting the door screws to close it slowly or quickly, to better adapt to the actual needs of the door. Easy to assemble Install the door closer between the door frames, insert the Allen key into the Allen screw hole on the top and rotate it to secure. According to the weight of the door used, adjust the required resistance in the six adjustment holes. Protective door The automatic door closer will reduce the resistance when closing the door, protect the door from damage and reduce noise, which can provide you with a safe and comfortable life. Widely used It is suitable for wooden doors and aluminum alloy doors in homes, offices, doors firewalls, hotel rooms, indoor and outdoor areas. Note: The data are manual measurement, please allow a 1-3cm error, due to the differences between the light and the display, there will be a certain color difference, the specific received in kind prevail.