Makita is giving landscapers more options with both MM4® 4-Stroke Engine and 36V (18V X2) LXT® couple-shaft power heads (sold separately), and the Makita ER400MP Curved String Trimmer Couple Shaft Attachment is the right accessory for use with this versatile system. It quickly attaches to the power head for easy operation. The M8 x 1.25 LH shaft arbor fits common sized trimmer heads for increased versatility, with bump and feed for increased efficiency. The curved shaft is engineered for improved balance and maneuverability.