At the top-end of the string trimmer line there exists a tool worthy of putting in the Terminator's (Arnold Schwarzenegger) hands. The Brush Cutter is designed for heavy-duty brush clearing with an extra-large motor and an aggressive cutting blade. Some models appear to have something kin to a motorcycle engine for power, a 2" to 3" shaft, an almost frightening 10" to 12" cutting blade and a harness to strap it on. If you want to "terminate" acres of scrub brush and up-to 4" diameter trees, this may be your tool. Before buying, make sure the balance and fit is comfortable to you.