The STIHL RAPID Duro 3 chain is a low-kickback upgrade from the previous model, offering significantly enhanced durability. It remains sharp up to four times longer than standard saw chains, making it a reliable choice for tough cutting tasks. Featuring standard-sized cutters, the RD3 delivers strong performance across a wide range of wood types. It's particularly effective when cutting dirty wood, treated lumber, roots, and hardwoods - materials that tend to dull conventional chains quickly. Note that this chain requires re-sharpening with a specialized formed diamond grinding wheel. Applications: The RD3 chain is ideal for demanding jobs involving dirty or treated wood, roots, and dense hardwoods.