Harper Trucks 700 lb Capacity Glass Filled Nylon Convertible Hand Truck and Dolly with 10" Flat-Free Solid Rubber  Wheels Manufactured in USA; Harper exclusive I-Beam Glass Filled Nylon Plastic Frame is 30% lighter than steel and designed for maximum strength (Plastic frame is factory Pre Assembled) Glass-Filled Nylon Plastic Frame is chemical, corrosion and rust resistant for longer life Converts in seconds from 2 wheel dolly to 4 wheel cart - 600 lb dolly and 700 lb cart capacity (Product images illustrates both uses, but only one cart is being sold) Heavy-duty 10" solid rubber wheels and 5" heavy-duty swivel casters Three position telescoping handle, built-in stair glides for easy moving up or down stairs and curbs. Requires easy assembly of wheels and base plate