[MULTI-PURPOSE] Straight shank twisting drill can engrave PCB, CNC, metal, plastic, wood, and more, ensuring versatility in various applications.[EXQUISITE CRAFTSMANSHIP] Tungsten steel drill bit undergoes high temperature quenching heat treatment for enhanced hardness, providing comfortable usage.[INCISIVE PRACTICALITY] Carbide drill bit offers excellent milling and cutting performance with fast drilling speed, ensuring high work efficiency.[EXCELLENT MATERIAL] Made of tungsten steel, these drill bits provide high hardness, strength, and wear resistance for long-lasting use.[ABUNDANT QUANTITY] This set includes 10 twisting drills with sharp cutting edges and neat surfaces, for precise drilling without burrs.Spec:Item Type: Carbide Drill BitMaterial: Tungsten SteelHole Diameter: Approx. 4mm / 0.16inPackage List：10 x Carbide Drill Bit Note：