Features High Speed Steel Construction: Crafted from high speed steel, these drill bits offer exceptional hardness and durability, ensuring long-lasting performance for your woodworking projects. Corrosion-Resistant Coating: The black oxide coating on the drill bit surface provides mild corrosion resistance, extending the lifespan of the bits and maintaining their sharpness over time. Versatile 15-Piece Set: This set includes 15 pieces of drill bits in three sizes (3.0mm, 4.0mm, 5.0mm), with five pieces for each size, offering versatility for various drilling applications. Multi-Material Compatibility: Ideal for aluminum alloy, iron, wood, and plastics, these drill bits are perfect for a wide range of drilling jobs, making them a versatile addition to your power tool collection. Effortless Drilling: The sharp twisted design of these drill bits ensures effortless drilling, allowing for smooth and precise hole creation in different materials. Specification: Material: High speed steel Surface Finishing: Black oxide Type: Twist drill bit Size: 3.0mm, 4.0mm, 5.0mm Quantity: 5 pcs each size Hex Shank Diameter: 7mm Package Includes: 15pcs x Drill Bits Package List