A bore burnishing tool is a precision finishing tool, typically with carbide rollers, that creates a smooth, highly polished surface finish and increases surface hardness on the internal diameters (bores) of components through a process called plastic deformation. These tools are used in industries like automotive and aerospace to improve component lifespan, achieve mirror-like finishes, and reduce the need for other finishing processes. They come in various types, including those for through-bores and blind-bores, as well as different series like short, long, and universal to suit varying bore diameters and lengths.