Smoothly handles loads up or down stairs with little strain to you and few bumps to your load when you choose this EUROKRAFT Stair Glider Premium Six-Wheel Hand Truck. As one wheel comes in contact with a stair, the wheel above it is still in contact (and absorbing all the weight) with the stair above. Each set of wheels rotate independently up or down the stairs. Easy-to-grip frame is 1" diameter. Made in USA.