Inserts: M10x1.25 LH Female thread, Rotation: anti-clockwise Bump feed strimmer head, two-line cutting Pre-loaded with 2m of 2.4mm line, trimmer head diameter: 110 mm Compatible with most straight shaft trimmers with M10 x 1.25 left thread, The item comes without additional adapters in other sizes(M8 / M12), it just a trimmer head that fit M10 x 1.25, please check the thread size of your trimmer before you buy, thanks NOTICE: Most Petrol Strimmer with M10 thread, also many electric strimmers with M10 threads, BUT, Users of small electric grass trimmers should pay attention to some small electric strimmers are equipped with small heads and are M8 threads, this product does not fit M8