At first glance, Drills is often thought to be a tool that can be used easily, but as you can see from the fact that the difficulty of using tools has been described as "Ichi Drills, Two Planes, and Sanjiku" since ancient times, delicate attention is required to drill holes in the required size in the exact position.

Drills has a structure that makes a round hole in the material by giving rotational motion to the cutting edge. There are various shapes at the tip of the blade depending on the application and materials used. In addition, the pattern can be broadly divided into those that rub directly with the palm of the hand and those that use other mechanisms.

　　　　　　　　　　　　　　　　

In Japan, we have traditionally kneaded Drills when drilling nail holes, but in the Meiji era, when a bonding method using bolts was introduced along with Western-style architecture, a screw-shaped Bolt Drills came to be used, allowing thick and deep holes.