Echo 99944900061 18" x 3" Engine Drill Heavy Duty Auger. ECHO 3 in. Engine Drill Heavy-duty Auger (99944900061) is best suited for drilling larger plant holes or smaller tree potting holes. Save time and drill easier with an engine drill. The auger design has a soil-clearing whip that helps to lift away dirt from the top of the hole to ensure ample room for potting plants, trees or other shrubs. ECHO engine drill augers are engineered to fit ECHO engine drill models and most other engine drills.