It is a spare part for use with any of the condiment towers and centers. Each bin is dishwasher safe. They easily snap into the slots along the condiment towers and are just as easy to remove. They are very sturdy and professional quality. There are three clips on the back side of the bin to attach to the towers for varying heights. There is a clear line in the center of the frosted front so the level of the contents can be determined and refreshed in a timely manner.