- A knurling tool is a hand tool used to create a textured surface on a metal workpiece. - It is typically used to improve grip or to provide a decorative finish. - Knurling tools come in a variety of sizes and shapes, and can be used on both flat and curved surfaces. - Diagonal dual-wheel knurling tools are designed to create a diamond-shaped pattern on the workpiece. - They are particularly useful for creating a grip surface on round objects, such as handles or knobs. - Knurling tools are made from hardened steel and are designed for durability. - They are typically used in conjunction with a lathe or other machine tool.