Knurled wheels, also known as rosettes, are tools used to create textures on cylindrical surfaces, usually metal. These wheels are mounted on a lathe and pressed against the rotating object to imprint a series of grooves or ridges. Patterns such as straight, diagonal, or diamond-shaped knurls improve grip on items like handles, knobs, and other components. The dimensions of the rosettes, including diameter and pitch (distance between ridges), are typically measured in millimeters or TPI (teeth per inch).