PEACE AND SECURITY - The device turns off and locks automatically to ensure peace of mind and security. During breaks, you don't have to worry about your children running away from home or your dog or cat entering your room. EASY INSTALLATION: With door closer and surface mount plastic slide, installation is a breeze. (There is a detailed installation manual in the box, make sure there is no problem with the installation). This spring loaded door closer can be used on doors up to 150 lbs and can be used on left and right doors. High quality: Antioxidant, anti-corrosion, weatherproof, stable, wear-resistant, quiet, safe. Quality Assurance: Over 500,000 switch tests, 72 hour minimum salt spray corrosion test, inspection. INCLUDE - Surface mounted spring loaded door closer with instructions, pull rods, slide rails and plugs to cover the adjustment holes on the door closer body after setting the desired tension. product information Name: Automatic spring door closer Suitable for door weight: 10-60 (kg)