Gratnells | The Dynamis range from Gratnells is a flexible, cost-effective storage system, compatible with the award-winning Gratnells tray range. With both static frame and trolley options, the Dynamis range is perfect for any classroom environment. Trays are interchangeable between trolley and frame options so you can easily move equipment around the school as needed. Tall Dynamis combination units – 41.5 x 16.6 x 67.2” H (16 shallow trays per column). Low frames and carts – under desk – 14.6 x 16.6 x 28.2” H (6 shallow trays per column). Medium frames and carts – 41.5 x 16.6 x 33.5” H (8 shallow trays per column).