PRODUCT DESCRIPTION Agri-Fab 45-0365, 16-Inch walk behind Push Spike Aerator. 16-Inches wide, with 5 heavy duty spike discs. Soil penetration of 2.5 - Inches. Additional 35lbs to the top of the aerator to gain maximum soil penetration. AMAZON.COM Great for do-it-yourself lawn care, Agri-Fab's spike aerator perforates sod and grass to let in nutrients, air, and moisture for a healthier lawn. An array of rotating star-shape tines slices into the soil to allow additional seed, fertilizer, water, air, and light to reach the grass roots. The 5- to 7-inch spiked wheels provide up to 2-1/2 inches of aeration depth. The long axle offers a 16-inch aerating width to cover a lot of ground fast. The aerator is equipped with a steel weight tray designed to hold a concrete block that pushes the spikes into moist ground. Some tool-less assembly is required. --Brian Olson Some tool-less assembly is required