This Westinghouse Lighting 1/2-Inch by 18-Inch Extension Down Rod helps maximize your ceiling fan's cooling benefits by providing the proper height. It features a white finish that complements existing ceiling fans and tapered threaded ends for a secure connection. The extension down rod measures 18 in long by 1/2 in in diameter, and is ideal for rooms with 10-foot ceilings. It can be used with Westinghouse or other ceiling fans that require a 1/2-inch diameter ceiling fan extension down rod. For optimum performance and safety, ceiling fan blades should be at least 7 ft from the floor but no higher than 8 to 9 ft in order to best cool a room. For ceilings 9 ft and higher, an extension down rod is required to bring the ceiling fan down to the proper height above the floor.