Bon-6R 6-wheel stair lift trolley. 2023 model is a maneuver-type hand truck that allows you to raise and lower the stairs while rotating 3 wheels. Flat bed sheet for easy loading of cylindrical items such as cylinders. ★ Can load carbonate, oxygen and acetylene cylinders up to 40L 6000. Cylinder diameter up to 12.8 inches (325 mm). ★ 6 points of welded belt loops (1 each of the left and right) (4 places of the old model) Can be loaded not only with cylinders but also boxes without problems. For boxes, use the upper and lower belt loops to attach the belt vertically to keep the luggage stable due to the difference in steps. V-shaped bar on back for easy loading of gas cylinders. ★ 6.3 inches (160 mm) hard rubber tires so you dont have to worry about punctures. ★Repair 3 casters and rubber tires are sold separately. ★ Assuming a level of between 6.3 - 8.3 inches (16 - 21 cm). ★Stair load capacity is approximately 20-80k (20-80k). ★There may be slight scratches due to metal contact between the front and rear carts, while warehouse storage. Please note that there are slight scratches that do not interfere with use. ★The last red frame in the picture is for reference when loading the gas cylinder. ●In the event of an initial defect, we will replace it at the expense of the return and return shipping fee only within 1 week from the day of the arrival. ●Returns due to the customers preferences can be returned within 1 week from the date of arrival, and if unused or unpacked, it can be returned as long as you pay for the shipping fee. In case of return due to customers preference, please make sure to return it with payment. We will refund you immediately after receiving the product. Please note that we cannot accept returns or exchanges after one week.