Trimmer Head Grass Head Grass Trimmer Head nylon head &Trimmer head best quality 1,Material:Nylon2,Heavy-duty,semi-automactic Ø130mm ,M10*12.5 or M 8.0*1.25 left-hand male or female shaft thread.3,Suitable for brush cutters up to 51cc.Spool can load 6meters of round nylon line Ø2.4mm for professional users4,Adaptor:M10*1.25 or M8.0*1.25