The Autowinder II replace bump feed trimmer head eliminates tangled spools with its easy feed technology. Universal fit for 99% for all gas curved and straight shaft trimmers. Ideal for trimming and edging grass. Load line without opening the head.Provides more time to get the job done vs. spending time winding the line on a spoolNo need to open up the head, simply insert the line and crank the bump feed knob to easily load the lineUniversal fit for 99% of gas trimmersAccepts 0.080 to 0.105 in trimmer line sizes