Replace a damaged shelf or increase the storage capacity of your back bar refrigerator with this Avantco 178SHELFUBB4 24 3/4" x 21 1/2" middle shelf for UBB4 standard depth back bar refrigerators! This shelf is made of durable epoxy-coated wire for easy cleaning and long-lasting durability. It is specially designed for use in the center section of the unit and lets you adjust the capacity of your back bar by moving the shelf up and down to accommodate different product heights.