Stair Hand Truck Dollies(Four Handles). Quick and easy way for two people to transport loaded hand truck up and down stairways or hills. Easy grip handles provide comfort to persons using hand truck dolly. Removable handles conveniently store on back of hand truck when not in use. Steel construction. 10" x 3½" pneumatic wheels. Specs: overall size 21"W x 17 1/2"D x 44 1/2" H; nose plate 13 3/4"W x 6 1/2"D; capacity 500 lbs.