High-quality and durable materials. The bearing surface of the transmission unit is made of galvanized iron, which is scratch-resistant, corrosion-resistant, rust-resistant, stable, not easily damaged, and offers a long service life. Maximum load capacity. Our products have good load-bearing capacity, with a maximum capacity of 20 kg. The roller contains a 1.6 cm hardened steel ball that rotates on a 0.3 cm internal bearing for smooth motion. 360-degree silent rolling. The roller unit ball bearing is polished during production, resulting in a smooth surface. The universal 360-degree transmission bearing is flexible, fast, and stable, with low noise during operation. Includes screws for easy installation. The product comes with 16 screws for simple setup. The drive bearing has two screw holes. Use screws to securely attach the nylon ball conveyor to the item being transported. Suitable for various applications. Ideal for home use such as sofas, display cases, carts, shelves, scooters, cabinets, and kitchen equipment. Also used in transmission systems, power systems, processing systems, and packaging applications. Two-hole nylon bearings. Suitable for transmission systems, feeding systems, processing systems, and machinery. Premium material construction. The ball transfer roller is made of high-quality carbon steel, providing strength, durability, and excellent wear resistance. 360-degree swivel design. Features 360-degree swivel casters for high-speed, stable operation, enabling rotation and directional changes in conveyor systems. Strong load-bearing performance. The casters with integrated bearings offer high load capacity, supporting up to 20 kg per bearing, helping reduce labor intensity and operator fatigue. Low noise operation. The smooth surface of the ball bearing transfer wheel ensures quiet performance during transportation. Includes two screw mounting holes; 16 screws included in the package for easy installation. Wide range of uses. Commonly used in conveyor belt line installations, household appliances, transmission systems, processing systems, wooden crates, adjustable furniture, workbenches, and more. Specifications: Material: Galvanized iron plate + nylon Color: As shown in picture Screw size: 4 x 16 mm Weight: 250 g Package includes: 6 two-hole nylon bearings Note: Due to manual measurement, actual dimensions may vary by 0–2.5 cm.