Compatible model: can be used for all brands Sthil, Husquarna, Stiga and many other brands. Not suitable for the simple Load & Go – Tap & Go loading system. Line sliding system: Replaceable reinforced aluminum eyelets - Reinforced steel knob - Reinforced plastic structure - Head with D.130 - M10 x 1.25 - Internal insert - Maximum round diameter 4 mm - 1 refill of 7 m of 3 mm round line Wear resistant: Replaceable steel reinforced knob - Round line from 2.4 to 4 mm or square 3.5 mm Application: Align the segments. Pass the line through one eyelet of the head and let it come out on the opposite side until you obtain two strips of equal length. Turn the shaped knob anticlockwise. The head is ready for use. Internal threaded connection M10 x 1.25 - Universal for Efco and Oleomac brush cutters - For all other brush cutters, ask for information on compatibility or purchase the appropriate inserts.