Features: Brand new and high quality. 360 Universal Rotation: Multi-angle rotation, suitable for different environments, facilitating the movement of objects. Design with brake. Wide Wheel: Large side width and high load capacity, making it more durable and wear-resistant. Piston with Locking Ring: Piston with locking ring of sufficient height for easy maintenance and replacement. Solid Bearing: Better connection between the wheels, allowing for flexible and fast turning. Silent Bearing: Smooth and quiet movement. No squeaking or creaking. Specifications: Material: Alloy + Nylon. Type: A/B. Wheel A Height: Approx. 74 mm/2.91 in. Wheel A Width: Approx. 35 mm/1.38 in. Wheel A Diameter: Approx. 41 mm/1.61 in. Thread A Diameter: Approx. 8 mm/0.31 in. Wheel B Height: Approx. 78 mm/3.07 inches Wheel B Width: Approx. 40 mm/1.57 inches Wheel B Diameter: Approx. 50 mm/1.97 inches Thread B Diameter: Approx. 8 mm/0.31 inches Note: 1. Please allow 1-2 cm error due to manual measurement. Please make sure this does not bother you before ordering. 2. Due to the difference between different monitors, the actual color of the item may vary slightly from the picture. Package Includes: 1 x Chair Caster