The Toro 140-1246 Lawn Tractor Mulching Blade cuts grass and processes clippings into fine pieces for use on compatible mower decks. This 24.5-inch blade mounts to the spindle and rotates during operation. It works by using curved edges and an extended cutting surface to lift grass and cut it multiple times within the deck before dispersing it. Replacing a worn blade restores consistent cutting and proper mulching performance.