Features: Achieve professional precisions with our self centering drill bit set, featuring a unique designs that ensure perfectly centered pilot holes for screws every time. Crafted from high speed steel, this drill bit set boasts a quick change hexagonal shank, offering longevity and seamlessly integration with your existing tool. For carpenters, contractors, and diyer enthusiasts, this drill bit set is a must having for anyone looking to execute flawlessly installations of hinges, handles, and hardware with ease. Whether you're working on custom cabinetry, door hinge installation, or general woodworking projects, these bits provide the reliability needed in both professional workshops and home garages. Elevates your drilling capabilities with our hexagonal shank drill bits; not only do they streamlined your workflow with their change convenience, but they also ensure that every screw sits just right, enhancing the structural integrity of your work. Specifications: Component:Alloy Size:As Picture Shown The 5/64-inch diameter is about 2mm,which is suitable for 2.2-2.8mm self-tapping screws. The diameter of 7/64 inch is about 2.8mm, which is suitable for self-tapping screws of 3-3.5mm. The 9/64 inch diameter is about 3.5mm, which is suitable for self-tapping screws of 4-4.5mm. 11/64 inch diameter is about 4.5mm, which is suitable for self-tapping screws of 5-5.5mm. Package Includes: 1 Set Self Centering Hinge Drill Bit 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.