tools for drilling through rock in tunnels, specifically designed ...

Overall, bit drilling is a versatile and efficient drilling method that is widely used in various industries. Its ability to cut through hard materials quickly and accurately makes it an essential tool for applications where precision and speed are paramount. By understanding the advantages and limitations of bit drilling, industries can effectively harness its capabilities to achieve their drilling objectives effectively.

...
  • Tap drill bits are available in a wide range of sizes and shapes to fit different tap sizes and hole diameters. The size of a tap drill bit is determined by the diameter of the threaded section, which is usually designated by a letter and a number. For example, a tap drill bit with a size of 10-32 has a threaded section with a diameter of 0.1378 inches (3.5 mm) and a pitch of 0.0138 inches (0.35 mm).