Because drainage became impossible even after cleaning with drainage pipe of air conditioner, we opened a hole to newly drain drain pipe to reinforced concrete building. The thickness of the wall is about 15 centimeters, but I have opened a preliminary hole with a vibration drill, so the penetration time with this drill should be 10 seconds. Hammer drill is rented at a nearby home center. There are no future plans to use, but as expected it is made by Bosch. Awesome sharpness? .
Used to drill a hole in the foundation of the house to pass through the fuel pipe of the pottery kerosene kiln. I thought about renting a hammer drill, but I borrowed a drill from an acquaintance and bought a bit. We were able to empty the 160 mm concrete foundation at once. It got cheaper than renting. As expected is BOSCH.