High Quality Material: Ball transfer unit is made of high quality carbon steel, anti-corrosion and wear resistance. 1 Rolling Ball Transfers: diameter: 1 inch, load capacity: 40 KG; there are two holes on both sides of the base. mounting bracket for quick and easy installation. Wide Application: Universal rotation ball casters can be widely used in conveyor lines installing, processing system, wooden case, transmission furniture, workbench, home appliance, transmission system, etc. 360 Degree Universal Transfer Bearings: Rotation ball casters are convenient and flexible to roll, high-speed and stable operation, used for rotating and changing the direction of the conveyor. Please note that the quantity you receive depends on the quantity you choose.The number of titles only the maximum number of links. (other accessories demo in the picture is not included.)