These drilling machines are designed for producing relief holes. They are equipped with a gearbox that includes a percussion device (percussion drill shaft). Stuck rods can be loosened by switching the pneumatic motor to clockwise or counterclockwise rotation once or repeatedly using the percussion stroke (approx. 75°).
The machines are designed for use in difficult conditions and are particularly suitable for large-diameter holes with short lengths. On request, the drilling machines can be equipped with external silencers to ensure quieter operation of the equipment.