High quality vertical racks for chest freezers or liquid nitrogen tanks are made of corrosion resistant stainless steel. All racks include stainless steel locking rods. Security lock devices are also available for each rack... Using the internal dimensions obtained for your chest freezer or liquid nitrogen tank we can determine the maximum height (H) and number of racks you need for your chest freezer or liquid nitrogen tank. Vertical racks are sold with or without standard 15ml and 50ml centrifuge tube boxes.