Makita is giving landscapers more options with both MM4 4 Stroke engine & 18V x2 LXT (36V) cordless couple-shaft power heads (sold separately), & the brush cutter couple shaft attachment is the right accessory for use with this versatile system. It has a 10 mm left-handed thread shaft arbor that fits common sized trimmer heads for increased versatility, with a large multi-purpose grass shield that can be used with a trimmer head for grass blade. It has a bump & feed trimmer head for increased efficiency, with a steel drive shaft that is engineered for lower vibration & longer service life.