Come as a curved or straight shaft; the latter provides more power.
A. ECHO: Cuts a 17-inch-wide swath with 50 percent more torque than the standard straight-shaft string trimmer attachment. About $109; ECHO
B. STIHL: The contoured head on the straight-shaft string trimmer (shown) is designed to maneuver around obstacles, such as rocks and bed edges in a 16-inch wide path. About $90; STIHL. The curved-shaft version is about $50.
C. Troy-Bilt: The curved-shaft string trimmer turns into a blower at the flip of a lever so you can blow an edge clean after trimming it. About $70; Troy-Bilt
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