Earth auger is a kind of suitable for building fast into the hole in foundation engineering construction machinery, applicable to electric power, telecommunications, municipal, high-speed, high-speed, highway, construction, petroleum, timber and other column bar above the layer of soil pile and pier, drilling engineering of forest tree, multi-functional characteristics. Its construction of high efficiency, is the electric power, communication, municipal, railway, highway, construction, petroleum, trees, such as the ideal foundation construction equipment. Spiral drill is suitable for the filling soil, clay, powder soil and silt layer, sand layer and the drilling short screw can't contain part of the pebble and gravel stratum. Using core drill bit, can also be embedded in rock.