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Tunnel / Ground Support System

It is common practice to bump up the drive end of drifting steel for added strength at the rock drill end to accommodate larger diameter and shank adapters. Drill steel is available in many standard lengths to match the drill feeds on a multitude of available drifting jumbos.

1. Shank Adapter

2. Coupling

3. Drill Steel Hexagon / Round

4. Pilot Adapter / Reamer

5. Drill Steel Hexagon / Round 

 

6. Threaded Button Bit

7. Threaded Blade Bit

8. Tapered Button Bit

9. Tapered Blade Bit