Genuine OEM Echo Part | Fits Echo GT Series & Shindaiwa F Series CURVED-Shaft String Trimmers Only. Will NOT fit Straight shaft trimmers. | The head comes with .080" diameter trimmer line but will hold up to 20 feet of .095 trimmer line. | This head includes adapters to fit 3/8"-24 and 8mm right hand (standard) thread arbors. | Also Fits Husqvarna 26LC, 26RLC and 32RLC, Homelite HBC20, HBC24, HBC32C, HBC33, ST200, ST360, ST80, SXD20, TK518, RK521, ST100, ST120, ST155 and ST175CG