Spikes of 1.2 in reach past the thatch layer into the soil beneath, which is where aeration actually helps - shorter tines only perforate the surface. The 6 in roller spans 18 in, so a small lawn is covered in a few passes. A rubber grip on the 50 in handle keeps a hold in wet hands and takes the pressure needed to press the drum in. Steel with PP fittings weighs 7.5 lbs, light enough to carry one-handed and heavy enough to bite. Use it before feeding or overseeding for better water and nutrient uptake.