Features:It can be stationary, also can rotate 360 Brake function: turn up LOCK, castor can be stationary, turn down FREE, the caster can rotate 360 degrees Zinc alloy material, delicate appearance, strong and durable Smooth push and pull without hurting the floor, excellent anti-seismic and anti-shake performance, no fear of special road surface The wheels Perfect for office and residential furniture in apartments/shared offices Powerful carrying capacity: Each rubber caster wheel can support up to 30KG. Specification: Material: Zinc alloy Steering: universal caster Threaded Connecton Rod: 8mmSpecification: 2 inches Diameter: 51 (mm) Maximum load: 30 (kg) Scope of application: furniture, electrical appliances, office furniture/home/hardware products Color: black Package list: 4 x Swivel Castor .