Echo 99944900170 37" x 4" Earth Auger. ECHO 4 in. Earth Auger (99944900170) is best suited for drilling post holes, steel T-posts or U-posts or setting small plants. Its steel shaft construction is durable against light to medium soils. Rocky or heavier soil will require larger augers. The fish tail point allows for easier starting of the drill, prevents slipping and delivers better control and efficiency during operation. ECHO earth augers are engineered to fit ECHO earth auger models and most standard earth augers.