Also known as Independent Wheel Lawn Aerator. The key to a beautiful lawn is proper aeration. Without proper aeration to prevent compaction, grass can’t spread its roots into the soil. A core aerator will pull out cores of soil, and allow the ground to decompress to fill in the holes. The holes also allow grass seed and fertilizer to enter and penetrate into the soil and work properly. 8 tines are installed per wheel, the tines can penetrate up to 4″ to allow for awesome aeration. The Everything Attachments lawn aerators have a 2″ main axle with greasable wheels and outside bearings to greatly reduce wear on the axle.