Stihl TrimCut 51-2 mowing head with 2.7mm line. This Stihl TrimCut head has double line for mowing and thinning grass. The nylon line is adjusted by hand. The replacement trimmer head will take pentagonal, round or square 2.7mm cutting line.nTo fit Stihl models:nFS510C-EM, FS560 C-EM, FS550
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