Compatible Model: It can be suitable for all brands sthil, Husquarna, Stiga and many other brands. Not suitable for electric trimmers Load & Go Simple charging system – Tap & Go Cord flow system: Interchangeable reinforced aluminum eyelets - Reinforced steel button - Reinforced plastic structure - Head with D.130 - M10 x 1.25 - Inner insert - Maximum d. 4 mm round - 1 refill of 7 m of wire d. 3 mm round Wear-resistant: Button with interchangeable steel reinforcement - Round wire from 2.4 to 4 mm or square wire from 3.5 mm Instructions for use: Align the eyelets. Pass the wire into the head through an eyelet and let it come out on the side opposite until you have two edges of the same length. Turn the cast knob counterclockwise. The head is ready for use. Internal connection M10 x 1.25 thread – Universal for Efco and Oleomac brush cutters – For all other brush cutters, ask for compatibility or buy suitable inserts