Available in 4 foot and 5 foot effective digging depths. Each equipped with a 3/8 inch thickness, single pitch sectional or helicoid flighting the full length of the auger axle. 6710 Series augers utilize a Pengo® TYPE LDOBH cast steel boring head. For use with either the 671-16 Series DIG-R-TACH® and competitive models of popular hydraulic power earth drilling attachments utilizing a 2 inch hexagon auger drive connection.