Caster type: 3" Casters: 4 swivel, no brakes. Interior dimensions: 19-9/16" x 27-7/8". Our dollies save time and money by increasing the efficiency of transporting anything from stacks of sheet pans to catering equipment. Dollies can also be used to store unused equipment safely off the floor. Made of durable plastic, they're extremely durable and will last for years. They won't dent, crack, rust or corrode. Heavy-duty casters maneuver easily over all types of terrain.