MF-MM Lawn Dethatcher YARD BOSS® AttachmentNature rarely picks up after itself. The YARD BOSS dethatcher attachment for the STIHL YARD BOSS yard care system picks up what nature leaves behind, grabbing dead grass and other accumulated materials directly from the top of the soil. Like a vacuum cleaner for your grass, this attachment cleans up your lawn, allowing in more sunlight and nutrients. NOTE: This attachment must be used with large deflector and extensions.