The Agri-Fab 40-inch curved spike aerator lets nutrients into lawns. This spike aerators use a series of rotating star-shaped tines that slice into the soil to allow seed, fertilizer, water, air, light and nutrients to reach the grass roots. It features 12 9-inch spike wheels and 60 curved spikes that penetrate up to 3 inches in aeration depth. A single lever transport handle is easy to reach from the operator seat. Best for black dirt and loamy soils, this spike aerator comes with Agri-Fab"s 1-year limited warranty.