This heavy-duty door closer is made for a sliding door and designed to prevent the door from slamming shut and bouncing. It will close the door slowly and quietly without noise. It is not only can protect against finger injuries resulting from a slamming door accident but also able to saving electricity by keeping the door closed in an air-conditioned room. In every product packaging, it will come complete with an installation guide that you have to follow, and you will be able to install it right away and easily. This line up with 2 different products for door weighing 30 kg and 60 kg, which available in 4 different colors, is succeed to sold about 5000 sets/ year.