Rock drilling tools factory ProDrill manufactures high quality rock drill bits, one of the most important size for benching and long-hole drilling underground is T51 Flat Face Threaded Button Bit

T51  Dome Button Threaded Drill Bit

Diameter: 76mm, 89mm, 102mm

 
Skirt body: retrac, and normal, straightrac
Face type: flat, uniface, Drop Center
Carbide shape:  Dome, ballistic, semi-ballistic

Used in bench drilling, underground long hole drilling to match extension MF rod, MM rod heavy duty top hammer.
T51 Dome Button Threaded Drill Bitwith flat face design, 89 mm diameter match with extension drill steels.

T51-89-14button FF spherical bit, 13mm*8+12mm*6