Harper Trucks Lightweight 400 lb Capacity Glass Filled Nylon Plastic Convertible Hand Truck and Dolly 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 assembled and is chemical, corrosion and rust resistant for longer life Converts in seconds from 2 wheel dolly to 4 wheel cart - 300 lb dolly and 400 lb cart capacity (Product images illustrates both uses, but only one cart is being sold) 8" wheels with solid rubber tread and 3" swivel casters Three position telescoping handle, built-in frame glides for easy moving up or down stairs and curbs