Designed to put nutrients into lawn by using 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. Best for black dirt and loamy soils. SPECIFICATIONS: Steel weight tray, (12) 9 in diameter spike disks, 7 in x 1.5 in semi-pneumatic transport wheels. 64 lbs. tool weight.