Features: Experience precise and stability with our 300mm hexagonal shank self locking extension bar drill bit, designed for deep hole operations with a secure self locking mechanism to prevent slippage. Constructed from high quality carbon steel, this drill bit features strong magnetic absorption for quick bit changes and enhances durability, ensuring long lasting performances. Ideal for professional carpenters, renovation specialists, and DIY enthusiasts, this tool enhances work efficiency and ease of operation. Perfectly suited for furniture assembly, construction projects, and home repairs, especially in scenarios requiring deep hole drilling. Upgrading your toolkit with this extension bar, a must have for anyone looking to achieve precise and efficient drilling in challenging environments. Specifications: Component:Carbon Steel Length:Approx.300mm/11.81inch Color:Black Package Includes: 1pcs Drill Bit Adapter 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 coloring of the item. Thanks for your understandings.