Features Exceptional Durability: Crafted from high speed steel, these drill bits ensure long-lasting performance and withstand rigorous drilling tasks with ease Enhanced Corrosion Resistance: The black oxide coating provides mild resistance to corrosion, extending the lifespan of your drill bits for consistent use Versatile Size Range: Featuring 15 pieces in three sizes (3.0mm, 4.0mm, 5.0mm), this set offers the perfect twist drill for various drilling applications Multi-Material Compatibility: Ideal for drilling through aluminum alloy, iron, wood, and plastics, making them suitable for a wide range of projects Effortless Drilling: The sharp, twisted design of these drill bits reduces friction, allowing for smoother and more efficient drilling without excessive effort 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