1 Tools explanation: Drills

At first glance, Drills is often thought to be an easy-to-use tool, but since ancient times, it is necessary to have delicate attention to drilling holes in the exact position, as can be seen from the expression of the difficulty of using the tool, such as "One Drills, Two Plane, Three Maku".

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

　　　　　　　　　　　　　　　　

In Japan, we traditionally used hand-rubbed Drills when drilling nail holes, but in the Meiji era, when a bolt-based bonding method was introduced along with Western-style architecture, screw-shaped vault Drills began to be used, which made thick and deep holes.