Makita Mulching Plug Set for DLM431Z DLM432Z LXT Cordless Battery Lawn Mowers In a few simple steps, the mulching wedge is mounted in the DLM460Z, DLM382 and DLM432 models. Box contents: Mulching wedge for converting the battery lawnmower DLM460Z DLM382 and DLM432. Why use a mulching plug set for your mower? Mulching mowers are useful machines in caring for the lawn, but their purpose is not to provide "mulch" in the conventional sense. The clippings from mulching mowers are torn into tiny particles that, once they're on the soil's surface, are quickly broken down to release nutrients. The grass clippings left behind by a mulching mower essentially function as a lawn fertilizer, as if you were applying compost to the lawn.