Reinforced Aluminum Construction: Made with strengthened aluminum alloy for extended resistance to wear, suitable for wooden, metal, and doors 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 Strong Internal Mechanism: Incorporates hardened steel gear shaft, resilient spring steel winding and precisely engineered cylinder for stable long lasting function without leaks 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 noise Customizable Two Phase Speed Control: Allows individual of closing speed ( 180 15°) and latching speed ( 15° 0°) through simple screw tuning for tailored configuration, Manufacturer: Kaeltsyn