These engraving tool replacement bits are for performance and longevity. Made from tungsten steel, they are for detailed engraving and milling on PCB boards and other materials. Ideal for both intricate designs and general milling tasks, these bits are essential for any craftsman. Features -Color:Silver -Material:Tungsten steel -Size:4.00X0.30X0.30cm/1.57X0.12X0.12in -Note: Shank Diameter: 3.175mm/1/8 inch; Cutting edge diameter: 0.8mm / 0.031 inch - tungsten steel drill bits: constructed from stable tungsten steel, these bits offer excellent wear resistance and longevity, even under high intensity machining conditions -engraving drill bits: advanced cnc technology ensures precise cutting, enabling users to achieve intricate designs and detailed finishes with ease -Wide range of applications: engraving drill bits for engraving and milling on pcb boards, and other hard materials, meeting diverse crafting and industrial needs -Compact and adaptable: engraving drill bits are small and lightweight design fits various engraving machines, providing users with greater control and operational convenience -Efficient processing: designed for high speed cutting, these bits enhance productivity by reducing machining time without compromising accuracy Package list: 10 x End Milling Engraving Bits