360° Rotation: The top plate equipped with premium steel balls, can rotate 360 degrees swiftly and smoothly with ease, easy to flexibly transform directions. Solid Rubber Wheels: Made of high quality non-marking rubber material, absorbs shock and vibrations, wear-resistant and roll silently, protecting your floors from scratches. Double Lock Mechanism: The locking mechanism can lock both the wheel and the swivel at the same time, which is essential for security and stability. 330LBS Capacity: Each caster can load capacity up to 330lbs. Perfect for flight cases, display equipment, light machinery, cabinets, equipment stands, furniture etc. Heavy Duty Bracket: Thickened galvanized steel plate body is extremely hard wearing, corrosion and dust resistant, strong and durable for long service life.