The spiral auger operates similar to a corkscrew and does not cut off the soil. The auger is usually applied when hard layers need to be penetrated, e.g. brick layers, chalk and lime profiles. The narrow twist drill pushes the stones aside while drilling and digs with specially shaped ends of a hole. The straight shape is created when pulling the drill much frictional resistance.
Technical data:
.Spiral auger, Ø 4 cm: 1.5 kg, 126 × 39 × 4 cm