Features High-Speed Steel Durability: Crafted from premium high-speed steel, these drill bits ensure exceptional hardness and longevity for all your drilling tasks Enhanced Corrosion Resistance: Each drill bit features a black oxide coating, providing superior mild resistance and extending the lifespan of your tools Versatile Size Selection: This set includes 15 drill bits in three essential sizes (3mm, 4mm, 5mm), with 5 pieces of each size, catering to a wide range of drilling needs Ideal for Various Materials: Perfectly suited for drilling through aluminum alloy, iron, wood, and plastics, making these bits versatile for multiple applications Effortless Drilling Experience: The sharp spiral design of these bits ensures smooth penetration, reducing effort and increasing efficiency during your projects Features: 1、Twist drill bits are made from high speed steel for high hardn and durability 2、The of drill bit is coated with black oxide to add mild resistance 3、There are 15 pieces drill bit in three sizes of 3.0mm, 4.0mm, 5.0mm, five pieces for each size 4、They are great for most drilling jobs and materials such as aluminum alloy, iron, wood, plastics 5、Sharp twisted drill bits will make the drilling easier and more effortl Specification: Features: Twist drill bits are made from high speed steel for high hardn and durability. The of drill bit is coated with black oxide to add mild resistance. There are 15 pieces drill bit in three sizes of 3.0mm, 4.0mm, 5.0mm, five pieces for each size. They are great for most drilling jobs and materials such as aluminum alloy, iron, wood, plastics. Sharp twisted drill bits will make the drilling easier and more effortl. Specification: Material: High speed steel 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