The TW84, TW96, TW120, TW144, TW168, TURBO96 & TURBO120 mowers are rated for material up to 3".
The CY Series CY60, CY72, and CY84 heavier-duty mowers are rated for material up to 4".
The GR Series extreme duty rotary mowers are rated for material up to 4-1/2" in diameter.