Features: Boosting productivity with this 9 piece double tip drill bit set featuring heavy duty high speed steel construction, engineered to eliminate frequent bit changes and deliver double the drilling efficiency in metal, wood, and plastic materials. precise engineered tips maintain sharpness through extended use, while the compact impacts resistant plastic case ensures secure organization and portability for job site mobility. Designed for professionals and diyer enthusiasts requiring reliabled performances for demanding applications, particularly suited for contractors and craftsmen handling multiple drilling tasks daily. exceling in workshop projects ranging from furniture assembly to electronic installations, offering millimeter perfect accuracy in woodworking and metal fabrication scenarios. This versatile toolkit combines industrial grade durability with user friendly convenience, making it essential for both household repairs and precise focused engineering projects across multiple materials. Specifications: Component: high speed steel Specifications: 3+3.2+3.5+4+4.2+4.5+5+5.2+6mm Storage Box:78.5x35.5mm/3.09x1.39inch Suitable for home decoration, woodworking, metal processing and other usage scenarios Package Includes: Pack of 9 Double Head Drill Bits 1pcs Plastic Storage Box note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.