Feature Highlights: 1. Durable & High-Quality Construction – Crafted from premium iron with a matte finish, these residential door hinges are built to be rust-resistant, heavy-duty, and long-lasting for reliable performance. 2. Smooth & Quiet Operation – Designed with plain bearing construction, these bifold door hinges ensure smooth closing. The pin is infused with damping oil for noise-free, creak-free opening and closing. 3. Wide Range of Applications – Suitable for interior and exterior use, these hinges can be mounted on door frames, wooden boxes, shed windows, shutters, vents, apartments, playhouses, animal shelters, and more. 4. Precision Engineering – Features a thickened zinc-based alloy blade, stamped as one piece by CNC lathe for superior hardness, durability, and extended service life without easy breakage. 5. Tool-Free & Easy Installation – Designed for quick and hassle-free setup, these hinges can be installed in seconds without the need for additional tools. Product Details: These heavy-duty interior door hinges combine robust iron construction with a noise-dampened pin system for smooth, silent operation. Ideal for both indoor and outdoor applications, they offer enhanced durability and effortless installation. The reinforced zinc-alloy blade ensures lasting strength, while the matte finish adds a clean, modern look. Perfect for bifold doors, cabinets, sheds, shutters, and various structural projects. Specifications: - Material: Iron with matte finish / Zinc-based alloy blade - Finish: Grey - Type: Bifold door hinge - Features: Noise-free pin, plain bearing construction, rust-resistant - Item No.: 394903639 - Compatibility: Suitable for insulated glass doors, window frames, and similar hardware applications