This Lawnflite 42cm mulch kit is designed to help you recycle your grass whilst mowing. With the mulching kit fitted the 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 kit will fit the following Lawnflite lawnmowers: Optima 42cm (16") cut Smart 42PO push