Strong aluminum head. With a simple charging mechanism. Uses 26 cm pre-cut thread in all designs between 2.0 mm to 4.0 mm. Comes with pre-cut FLEXIBLADE ™ and washers to fit most of the clearing saws with counterclockwise rotation. Has a graduated profile that supports the wire over a larger area, which prevents overheating and the wire from coming off prematurely. Ideally, place the FLEXIBLADE, TECHNI-BLADE and the square wire at a 45 ° angle. Designed with 4-wires for clearing saws of 40 cc and up, for tougher application outdoors and in forestry. The four wires are mounted in two levels to cut and break thick vegetation.