Now you can turn your Stihl YARD BOSS® into a quality wheeled trimmer, adding ease and convenience to your trimming tasks all for much less than the cost of a dedicated trimmer mower. The Stihl FS-MM trimmer attachment features a dependable Stihl AutoCut® 25-2 trimmer head for precision cutting tasks. To advance the line, just tap the trimmer head against the ground. Need to change the trimmer head The FS-MM trimmer head is designed to be removed and replaced with a wide range of Stihl trimmer heads, including Stihl SuperCut™, FixCut™, DuroCut and more.