The GREENLEE Impact Auger with Teflon 15/16" x 18" is an efficient and durable solution for fast, smooth drilling. Its low-friction PTFE coating prevents chip packing and its unique self-feeding screw point tip allows for smooth starts and depth control. For even longer bit life, this auger is induction-hardened from durable steel and lasts up to 5x longer than the competition. The 7/16" hex shank provides a quick-change groove fit for impact drivers and, with Bit Extensions, can offer further drilling length.