General description This 20Pcs HSS Burr Set is designed for woodworking and carving, providing an easy cutting experience with high accuracy. Made from high-quality high-speed steel, these milling cutters are wear-resistant and durable, ensuring long-lasting performance. Technical specifications Material: High Speed Steel Shank Diameter: Approx. 3mm / 0.12in Total Length: Approx. 40mm / 1.57in Usage Suitable for engraving, chamfering, slotting, reaming, and hollowing of soft materials such as wood and plastic. Not recommended for processing hardwoods like walnuts and linden roots.