BM23975: Grass Mulching Attachment, High Capacity, 48 inchJohn Deere mulching systems use durable blades designed to chop grass into very small particles. The mulch that is distributed across the lawn will turn to feed, eliminating the need for bagging. This improves efficiency by reducing cleanup time. A Grass Mulching Attachment for 48? inch High? Capacity (HC) mower decks. It converts a 48HC deck into a dedicated mulching system. Compatible with many ZTrak models in the Z500 and Z600 families.