This Lawnflite mulch plug is designed to help you recycle your grass whilst mowing. With the mulch kit fitted the lawn mower will cut then re-cut the grass clippings into very fine pieces which are deposited back on to the ground. These tiny pieces virtually disappear into your lawn providing the extra nutrients & moisture needed for healthy root growth. This mulch kit will fit the following Lawnflite push Smart lawnmowers: Smart 40POSmart 46PO