General description This 6-piece HSS Combo Drill Bit Set features a hex shank design for mechanical use, allowing for efficient drilling and tapping. Made from two types of high-speed steel (4341 and 6542), this set is ideal for various materials, including wood, aluminum, and low-hardness metals. The drill bits are wear-resistant and sharp, ensuring high drilling speed and improved work efficiency. Technical specifications Material: High-speed steel 4341 and 6542 Sizes: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5 Total length: 54mm (M3), 54mm (M4), 56mm (M5), 57mm (M6), 58mm (M8), 58mm (M10) Pitch: 0.5 (M3), 0.7 (M4), 0.8 (M5), 1.0 (M6), 1.25 (M8), 1.5 (M10) Quantity: 6 pieces Usage Suitable for rapid drilling and tapping in wood, plastic, thin copper, aluminum, and thin 304 stainless steel plates (up to 2mm) Not suitable for hard materials such as flat steel When drilling, inject water to cool the drill bit If cooling is not possible, reduce drilling speed and limit the number of