Brown 600 series brush cutters are designed to mow grass and brush up to 4" in diameter. This model requires a tractor with a minimum of 60 horsepower.When it comes to the overused modifier "heavy duty" nothing comes close to matching the design of the Brown 600 series rotary cutter. The immense weight of the solid blade bar achieves unmatched cutting power while reducing shock loads on your tractor. This machine will easily handle brush up to 4" in diameter as well as cut grass and weeds for efficient pasture management.