Genuine Toro Atomic mulching blade, 55.2 cm (21.75″) long. The toothed profile (often called a gator blade) is the one to spec when you want clippings chopped finer and left in the turf. Fits the Groundsmaster 3280-D, 360, 4000-D, 4010-D, 7200 and 7210. Confirm model and serial number before ordering.