The heavy duty Staircrawler Dolly ‘CT420’ has a capacity of up to 420kg, which allows you to move objects upstairs and downstairs by a single person. By automatically adjusting the object’s gravity center, it can easily keep balance when climbing, and it can also move easily and safely on flat ground in flat ground mode. It is suitable for moving big safes, building materials, engines, gas cylinders, pianos, precision instruments, security check machines, vending machines, and more.