InertiaDrive Technology combines a larger diameter cutting reel and heavy blades. 2 times more cutting power cuts through small twigs, weeds, and dense grass. StaySharp cutting system cuts grass without blades touching, which reduces blade wear. Ergonomic padded handle design. Grass discharge chute throws clippings forward. Insert rear wheels allow for closer cutting. Chain drive with all-steel gears. 1-touch height adjustment from 1" to 4". 4 year warranty. 18" blade.