The thickness which a pole saw can cut depends on its size and power. The maximum thickness is 9 inches, but not all pole saws can cut this thick; only heavy-duty ones can, but still, it is not easy and also risky. Average thickness many pole saws can address is 4 inches. Anything less than 4 inches thickness is not of a big issue for most of the pole saws, and they can be taken down comfortably.