These Center bars simply slot over each side of the garment rail and can be adjusted to the height you require. Once in place they offer an extra tier to store additional garments and are useful for smaller items such as baby clothes, underwear etc. The center bar can also be used in conjunction with our extension posts allowing you to use the additional rail for longer garments such as adult T-shirts etc. This bar can only be used with our 5ft rails. Can only be used with our standard heavy duty rails.