Wheel diameter: 38, 50, 65, and 75mm Wheel width: 23 to 30mm Thickness of the rig: 1.8mm Load capacity: 38 to 70kg Material: nylon Color: white Style: top plate/screw swivel, rigid, top plate with side brake, screw with total brake, and screw with side brake Housing: zinc plating Four pieces in a poly bag, then in carton packaging Features: zinc plating and high loading capacity Usages: furniture casters, cart, trolley, medical appliance, machine equipment, and more