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 and moisture needed for healthy root growth.This kit will fit the following Lawnflite lawnmowersOptima 42cm 16 cutSmart 42PO push