The Balwaan MTAK-AC-EA-866 Black 12 Inch Carbide Earth Auger Drill Bit is a necessary tool for creating holes in the ground for construction. This specific model can drill through solid rock at depths of up to 100 meters, and as such is an important part of building roads, tunnels, and other underground structures. The MTAK-AC-EA-866 has a handle that can be folded in half for easy transport, and is capable of doing the vast majority of its work without the need for an external power source.I really like the Balwaan MTAK-AC-EA-866 Black 10 Inch Carbide Earth Auger Drill Bit. It's a high quality item and it is fantastic for the price. The only reason I didn't give it five stars is because I don't use it as much as I thought I would. So, if you are looking for a product that gets the job done and can hold up under pressure, then this is what you want/need.The MTAK-AC-EA-866 Black 10 Inch Carbide Earth Auger Drill Bit is an absolute must have for any tool box. This drill bit will plunge through the earth and take on any job you need it to do. From fence posts to drain holes, this drill bit will get the job done.