Used for installation of ventilating fan duct, hose. Although it was written as unsuitable for wooden construction, both the wooden wall and the board were able to drill cleanly. I used a 36 V hammer drill for the drill.
Although it is up to mortar, I tried using it in the foundation penetration work. The blade was lacking in 15 cm × 12 places, but the working time was considerably shortened. It is best if there is no blade chipping.