Rock drilling tools manufacturer ProDrill offers rock drill bits: A330 Threaded Button Bits is the most important size for drifting and tunneling drilling job.
A330 Threaded Drill Bit Specs
Diameter: 43mm, 45mm, 48mm, 51mm, 57mm, 64mm
Skirt body: retrac, and normal
Face: flat, uniface
Carbide: Dome, ballistic
Used in drifting and tunneling, or dimensional natural stone quarrying
Drift HEX rod :
A330-R28- H28 2600mm
A330-R28- H28 3100mm
A330-T38- H35 3660mm