An auger drill is a type of drilling tool that consists of a spiral or helical screw blade (called an "auger") that rotates and cuts into the ground or other material, creating a hole. Auger drills are commonly used in construction and landscaping projects for digging holes for fence posts, signposts, and trees. They can also be used in geotechnical drilling to collect soil samples or to install small diameter monitoring wells. Auger drills come in various sizes and shapes depending on the application and can be operated manually or by power sources such as gasoline or electricity.