Product Material: Galvanized iron Color: Silver Ball material: Nylon Ball diameter: 16 mm (0.63 inch) / 25 mm (0.98 inch) 16 mm unit dimensions: 48 x 32 x 20 mm (L x W x H) 25 mm unit dimensions: 75 x 50 x 30 mm (L x W x H) Package includes: - 4 x nylon furniture casters - 1 x screwdriver - 8 x screws - 16 mm and 25 mm diameter round ball transfer units Key Features: 1. Delivery Content: Includes 4 nylon furniture casters, 1 screwdriver, 8 screws, and ball transfer units with 16 mm or 25 mm ball diameter. Units feature two mounting holes for secure screw installation. 2. High-Quality Materials: Housing made of galvanized carbon steel for scratch resistance, corrosion resistance, and rust resistance. 3. Smooth Operation: 360-degree rotation for effortless movement. Each caster supports up to 15 kg load capacity. 4. Quiet Performance: Precision-polished surfaces and ball bearings ensure smooth, low-noise operation. 5. Wide Application: Suitable for home use (e.g., sofas, cabinets, shelves, carts, kitchen appliances) and industrial applications (e.g., conveyor systems, packaging machines, auxiliary equipment). Note: Please allow 1-3 mm error/1-3g weight error and actual product color may vary due to lighting conditions.