A hammer / hammer drill (electric) is a tool that drills and suspends concrete, stone, etc. using powerful impact and rotational force. Hammer drills are tools that can drill holes in concrete, steel, wood, and sanding, making them an indispensable tool in civil engineering and construction. For hammer drills, the larger the impact energy, the larger the body. If you continue to use the hammer drill at the maximum specifications, it will cause a failure. Use a hammer drill with power larger than the maximum size that can be drilled. When choosing a hammer drill, pay attention to the difference in shank shape and also check for the presence of a chipping function. There are two types of hammer drills: rechargeable types and cord types. The rechargeable type is convenient for outdoor use without a power supply, and has excellent power distribution without a power cord. In addition, there is a low vibration type that reduces fatigue even after prolonged use, and a dust collection function that absorbs dust during work.