An earth auger, earth drill, or post-hole auger is a drilling tool or machine manufactured by Shikhar Organization, which is  used for making holes in the ground. It typically consists of a rotating vertical metal rod or pipe with one or more blades attached at the lower end, that cut or scrape the soil. It has been in use since the Middle Ages to drill holes in wood. 

The most common design of it has a helical screw blade (the flighting) winding around lower part of the shaft. The lower edge of the screw blade scrapes dirt at the bottom of the hole, and the rest of the blade acts like a screw conveyor to lift the loose soil out of the way. When the hole reaches the desired depth and the tool is pulled out, the screw blade scoops out the remaining loose dirt. The rod may end in a sharp point protruding below the screw blade. Its purpose is to push the dirt that lies just below the rod to the sides, where the blade can pick it up. It also helps keep the hole straight by prevent the auger from wandering off to the side. The lower edge of the screw blade may have teeth.