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 Threaded Button 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.
14 Semi-ballistic carbide inserts T51 threaded drill bit with flat face design, 89 mm diameter match with extension drill steels.
For more details please watch PDF online: T51 Drill Bits for Bench Drilling, Long Hole Drilling Underground Catalogue