Construction Drilling

45 mm R32 Button Bit for Hard-Rock Jumbos

• Size45 mm (1.77 in); R32
• ConnectionR32; source taper wording requires clarification

35 mm Seven-Button Cold-Pressed Bit for Tunneling

• Size35 mm (1.38 in)
• ConnectionNot stated; verify drill rod interface

32–50mm Cross Carbide Drag Bit for Mining Tunnels

• Size32–50 mm (1.26–1.97 in)

38mm Flat Alloy Drag Bit for Construction Drilling

• Size38 mm (1.50 in)

40mm X-Type Cross Drag Bit for Pneumatic Rock Drilling

• Size40 mm (1.57 in)

Medium-Formation Bit Selection for Construction Drilling

How to Choose Drill Bits for Construction Drilling

Medium Formation Drill Bit Selection for Sandstone and Carbonates

Hard Formation Drill Bit Selection for Granite, Basalt, and Quartzite

Abrasive Formation Drill Bit Selection Above 20 Percent Quartz

Unconsolidated Formation Drill Bit Selection for Alluvium and Gravel