The best tool for cutting thick branches is a lopper or a pruning saw. Loppers, such as the Corona DualCUT Branch & Stem Bypass Pruner (1 Inch MAX Forged), are great for branches up to 2 inches in diameter. For even thicker branches, a pruning saw, like the Corona RazorTOOTH Folding Saw (10 Inch curved blade), is ideal.
These tools furnish the leverage and cutting power that enable you to do away with thicker branches efficiently and safely. Also, their quality construction ensures they remain functional over a long period of time even under heavy use.
You should always ensure that sharp and clean tools are used for best results. To keep your equipment going longer and improve the way you cut things—proper tool maintenance is very important.