Adjustable Stainless Steel Residential Commercial Automatic Door Closer

customer quality certification, 500,000 times switch experiment, bearing 20-35kg(45-77lb), Perfect for light doors in homes or businesses, Silent door opening and closing,very cost-effective spring door closer, smooth silver surface, stylish without lack of warmth, high-quality carbon steel springs, wear-resistant, long life cycle, can withstand more than 500,000 opening and closing times, Heavy-duty foldable design, highly human design installation guide, clear and easy to understand, easy to install, save time for you and your family, Easily adjust the tension of this safety spring door closer, and control the door closing speed at any time to adapt to your rhythm of life. You have been equipped with a suitable screwdriver