1. Brand-new products, high-quality craftsmanship, and exclusive discounts guaranteed. Buy now, and we will ship your order as soon as possible. Have a great day! If you have any questions about the product, please feel free to send us an email, and we will reply within 48 hours. 2. The 4-inch door wheel with an adjustable spring bracket is designed to allow the door to open and close freely. It has a load capacity of 50 - 60 kg and a spring clip that functions when the wheel rolls on uneven or rough surfaces. It also comes with a universal bracket suitable for wooden or metal doors. 3. The sturdy spring door wheel can adapt to the surrounding terrain to maintain the door's height throughout the opening and closing cycle. These rotating brackets are equally effective on both flat and uneven surfaces such as asphalt, bricks, concrete, soil, grass, gravel, and paving stones. 4. Color: Black. Size: 10 cm. Quantity per shipment: 1 piece. 5. We uphold the concept of customer first and provide 24/7 customer service. No matter where you are and what problems you encounter, we will solve them for you as soon as possible, allowing you to shop worry-free.