Here's how it works: The cutter deck is 5" deep for enhanced vacuum and mulching ability. The front, Custom-Cut™ Baffle, is adjustable to provide an extra level of cutting performance not available anywhere else. This baffle allows grass to stand up before the blade precisely cuts it. It prevents grass from getting bent over and missing the path of the cutter blades. Even tall, wiry grasses are cut clean, reducing "stringers" and double cutting.