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 ST58 Threaded Button Bit
Diameter: 115mm
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 drilling tools.
ST58 Uniface Retrac Threaded Button Bit
13 Semi-ballistic carbide inserts ST58 threaded drill bit with uniface face design, 89 mm diameter match with extension drill steels. Uniface bits are well suited for drilling straighter holes in less abrasive and less consolidated rock at a faster rate.
New DP1500i is performing drilling 102/115/127/140mm holes for bench and production mining