The Makita Mulching Lawn Mower Blade (191Y65-4) is for use with Makita LXT® and XGT® 21” Lawn Mowers (mowers sold separately) and is a direct replacement blade. The blade cuts grass into small pieces to be deposited in the lawn as fertilizer. The Mulching Lawn Mower Blade cuts cleanly and creates fine clippings promoting lawn health. It features an easy one bolt blade installation. It is constructed of high-quality materials for a long life.