Legendary Lawnaire Performance and Durability with Easy Steer Technology. The tine assembly allows the operator to steer the unit without taking the tines out of the ground. This is accomplished by designing each tine assembly to independently rotate yet be able to drive. This translates into higher productivity and less physical stress on the operator because it is easier to use. Thirty tines spread over a 19-inch swath offer a productive aeration rate of nearly 29,000 square feet per hour.