Stihl Trim Cut 41-2 cutting head with 2.7mm line. This Stihl Trim Cut replacement head has double line for mowing & thinning grass. The nylon line is adjusted by h&. The replacement trimmer head will take pentagonal, round or square 2.7mm cutting line. To fit Stihl models: FS310, FS400, FS450, FS480 Only approved for use with a guard