Heavy Duty Caster Wheels Steel 5 Inch Polyurethane Wheel Swivel Caster Brake Ball Bearing Galvanized Surface Silent Operation. High Load Capacity: Maximum load up to 450kg per caster with robust steel construction. Durable Polyurethane Wheels: Industrial strength PU tread bonded to ribbed polyolefin core for shock resistance. Ball Bearing System: Full double ball raceways hardened for smooth rotation and long life. Customizable Options: Packing, color, size, and material are fully customizable based on buyer needs. RoHS Compliant: Zinc plated finish meets RoHS environmental protection standards. Easy Maintenance: Equipped with grease fittings in wheel bearing and swivel raceway. Multiple Size Options: Available in 4, 5, 6, and 8-inch diameters for diverse applications. OEM and ODM Service: Support for custom logos, designs, and specialized caster solutions.