has been damaged The functionality of all these stair climber hand trucks depends on the wheels being larger than the open area between the steps or the stair being closed between each step. If the wheels are smaller - the wheels go between the steps and get stuck and don't work - like in my case. Since the listing does not contain competent and complete specifications, the buyer cannot determine whether the hand truck will work with their stair type and/or dimensions. All models and brands of Revain Stair Climbing Hand Trucks do not have the wheel diameter listed or are warned by the customer not to be operated on open stairwells. Shame on Raven.