Echo 99944200908 Speed-Feed 400 Trimmer Head 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