General description The Gray Residential Interior Safety Spring Door Closer is a heavy-duty automatic door hinge designed for convenience and security. It is suitable for doors weighing up to 69 kg and is ideal for various applications, including indoor gardens, outdoor doors, gates, and shed doors. Technical specifications Weight capacity: up to 69 kg Material: stainless steel Features: antioxidant, anti-corrosion, rust-proof, stable, abrasion-resistant, weather-resistant, quiet Installation Adjust the closer to a quarter turn at a time to avoid over-tensioning. Test the door after each adjustment to ensure proper function. Excessive tension can cause the spring to buckle. If lubrication is needed, disassemble the unit after relieving tension and apply white lithium grease directly to the springs. Usage Automatic closing and locking for enhanced security. Prevents pets from escaping or entering unwanted areas. Adjustable closing speed without the need for hands. Compatible with both