9" McMillen HD Auger Bit HDC 4'These McMillen Augers are made for difficult ground conditions, compacted soils, heavy clay, asphalt, frozen ground and fracturable rock. The HDC Augers feature a heavy duty cast steel boring head, hardened drive in gage (outside) and wisdom (inside) teeth. Equipped with hardened fishtail point and heavy duty double flighting. Made for difficult ground conditions, compacted soils, heavy clay, asphalt, frozen ground and fracturable rock Feature a heavy