Strong Internal Mechanism: Incorporates hardened steel gear shaft, resilient spring steel winding and precisely engineered cylinder for stable long lasting function without leaks Reinforced Aluminum Construction: Made with strengthened aluminum alloy for extended resistance to wear, suitable for wooden, metal, and doors Customizable Two Phase Speed Control: Allows individual of closing speed (180 15°) and latching speed (15° 0°) through simple screw tuning for tailored configuration Gentle Hydraulic action: This automatic door tighter contains an fluid mechanism that provides soft cushioning when closing, ensuring smooth and quiet motion to protect doors and minimize Two Mode picks: Includes standard type (auto closing from any position) and 90° stays open version (rest open beyond 90°), great for homes, offices or entryways, Manufacturer: Fentency