The surface of the load-bearing wheel is painted, which improves the corrosion resistance and prolongs the service life of the product. The green dust-proof ring protects the bead plate and the steel balls are arranged in a smooth and smooth manner. The directional wheel, the universal wheel and the brake wheel , a variety of styles, a variety of sizes, you can choose Features: high quality polyurethane material, green dustproof ring, thick bearing rivet, galvanized bracket, plastic dust cover, quiet and environmental protection, 360 degree free rotation, brake, strong load, easy to install, strong wear Free combination of casters, can be freely matched according to your needs A: directional wheel x4 B: universal wheel x4 C: brake wheel x4 D: directional wheel x2+ universal wheel x2 E: directional wheel x2+ brake wheel x2 F: universal wheel x2+ brake wheel x2 Product Name: Heavy Duty Castors Color as shown Specifications: 3 inches, 4 inches, 5 inches Type: directional wheel, universal wheel, brake wheel Material: Polyurethane 3-inch single wheel load: 110KG 4-inch single wheel load: 140KG 5-inch single wheel load: 150KG Suitable for: warehouses, shelves, trolleys, flatbeds, scaffolding, logistics and transportation, factory terminals, etc. note: 1. Package Content: Casters x4 2. The size of this product is measured by hand. There may be a slight error. Please refer to the actual product. 3. The products are taken in kind, due to lighting / light and other reasons may have a little color difference, please refer to the actual product. 4. We are 1-2 days delivery, 15-25 days to arrive, if you have any questions, please contact us, we strive to make you satisfied.