John Deere BM21816 Grass Mulching Attachment, 42 in. delivers high-performance mulching capabilities designed to enhance the versatility of your mower. This attachment comes equipped with a mulch plug and specialized mulching blades that work seamlessly with the StarLock™ blade mounting system on the 42-inch (107 cm) Mower Deck. It is also compatible with LT Series Tractors that do not use the StarLock system, providing flexible options for different equipment. The mulching blades can be used for side discharging as well, although this may result in a slight reduction in cut quality. I for maintaining a clean and polished lawn, this attachment ensures excellent performance and a professional finish for a wide range of mowing needs. Model Number: BM21816