A lathe knurling tool is primarily used to create a textured surface on a workpiece, typically made of metal. This process, known as knurling, serves multiple functions. Firstly, it enhances grip by adding ridges to the surface, making it easier to handle or manipulate the workpiece. Tool Steel Spring Action Clamp Type Knurling Tool Capacity 5-20 mmHolder size : 3/8" x 3/8" x 2 -1/4" Paired with LH & RH diagonal lines to form a Diamond Pattern.Can be clamped in Standard Holder of the Quick change tool post on the lathe. Hardened EN31 Grade Tool Steel Knurls of size - 3/4" x 3/8" x 1/4" bore.