The CFA auger is hollow stem continuous flight augers, which perfectly fit for the rotary drilling in foundation technology, which consisted of the water cock, Kelly bar, coupling, auger(screw) rod, lead auger (starter), screw directive and soil cleaner, wear parts and etc. It is the most economic and environment friendly technology. After drive the CFA auger to the certain depth, the concrete will follow into the pile through the hollow stem of the auger while lifting. It did work so fast.