STIHL 4180 200 0498 Kombi System FS-KM Trimmer Attachment with Metal Blade. When line trimmers arent enough, slide the FS-KM brushcutter attachment into your STIHL KombiMotor. Part of the STIHL KombiSystem, this heavy-duty brushcutter attachment features a 4-tooth cutting blade for weeds and thick, tough grass. Do not use for trimming around obstacles.