CONVERTIBLE DESIGN: This cart is three separate hand trucks bundled into a single product. There is 3 configurations: traditional upright, high-capacity cart, or angled for convenience. HEAVY DUTY CAPACITY : This Aluminum dolly cart position the heavy-duty hand truck can easily haul 750 lbs. While in the upright position, one can effortlessly move up to 550 lbs. NO-FLAT WHEELS: With our 10 inch Polyurethane tires and sealed ball bearings you will never get a flat while on the job again with the equipped flat-free tires and caster wheels. PRODUCT DIMENSIONS: The convertible hand truck measures 37 11/16"L x 20 1/4"W x 57 11/16"H and the toe plate spans 18"W x 7 1/2"D. ALUMINUM CONSTRUCTION: Anodized Aluminum Extrusions and Cast Aluminum Components are used for heavy duty dolly use. With this construction this dolly can withstand any environment.