Harper Trucks 850 lb Capacity Aluminum Convertible Hand Truck and Dolly with 10" Pneumatic Wheels Manufactured in USA; One step quick release posi-lock latch to convert from 2 wheel dolly into 4 wheel cart Extruded aluminum construction is 30% lighter than steel - provides 850 lb four wheel capacity and 600 lb two wheel capacity 10' pneumatic wheels and 5" mold-on urethane casters 51" Height, 22" Width 18" x 7 1/2" Base, 42" Long x 13" Wide platform