Maximize control for different types of loads. These hand trucks can transport boxes wherever they are needed. Transport loads smoothly and evenly over rough or uneven floors. 10" Dia pneumatic tires are standard on all hand trucks, which are 10-1/2" tires. 10" Dia industrial solid rubber tires are also available. The convertible hand trucks also have 5" x 1-1/4" poly-on steel swivel casters at the bottom of the handle.