Material: Iron Size: 6.8*6.4cm/2.6*2.5in 1. Sturdy and Durablily: This 90-degree self-locking folding hinge is made of high-strength material, capable of bearing heavy pressure and long-term use, making it highly durablily. 2. Easy to Install: This hinge is designed to be compact and easy to install. Simply tighten the screws to complete the installation. 3. Self-Locking Function: This hinge features a self-locking function to ensure that doors or windows remain tightly closed, preventing drafts, moisture, or other details from entering the interior. 4. Folding Design: This hinge employs a folding design that allows doors or windows to be easily folded, saving space and making the room more spacious. 5. Versatile: This hinge is suitable for various doors and windows, including wooden doors, aluminum windows, and plastic doors and windows, making it highly practical for home, commercial, and industrial applications. Package Includes: 1pcs*90 Degree Self-Locking Folding Hinge (with screws)