The stackable food drying trays can be made of stainless steel and galvanzied steel. Besides, the stackable food trays also can be meshed or perforated. By using the stackable trays, trolley racks are not essential,which can save cost for clients. While using the stacking trays, only inserting the top one into the bottom one,which is safe and won't be shake. The stacked trays are not only used in drying food, but also used in steaming, cooking or freezing food.