This deflector by Earthway directs your spreading material where you want it to go. Keep the salt on the sidewalk and driveway or in the parking lot. Keep your top dressing material on the turf you are overseeding. Even when composting, it is sometimes useful to be able to regulate the direction of the flow of material to keep it in the bed and off the driveway or sidewalk. This deflector can be brought down on one, two, or three sides as you please.