Here is a list of some of the most well-known, leading global suppliers of flat drill bits:

```markdown

Leading Global Suppliers of Flat Drill Bits

1. Bosch

   • A major player in power tools and accessories, Bosch offers a wide range of drill bits, including flat bits.

2. DeWalt

   • Known for durable and high-quality tools, DeWalt produces a variety of drill bits suited for professionals.

3. Makita

   • Makita is a leading manufacturer of electric power tools and accessories, including flat drill bits.

4. Irwin Tools

   • A trusted brand for tools and fasteners, Irwin offers a selection of flat drill bits with innovative designs.

5. Milwaukee Tool

   • Milwaukee is recognized for its high-performance tools, including a range of drill bits tailored for demanding applications.

6. Black & Decker

   • A household name, Black & Decker manufactures an array of tools and accessories, including flat drill bits for DIY and professional use.

7. Hilti

   • Specializing in construction and building maintenance, Hilti provides premium quality drill bits for various applications.

8. Klein Tools

   • Known for tools that cater to electricians, Klein Tools offers specialized drill bits, including flat types.

9. Starrett

   • A manufacturer renowned for precision measuring tools, Starrett also produces high-quality flat drill bits.

10. General Tools

    • This company offers a variety of tools for different applications, including flat drill bits designed for specific tasks. ```

These companies are recognized for their innovation, quality, and significant market presence in the industry. Depending on your specific requirements (like material, size, or region), the choice may vary.