Rock drilling tools factory ProDrill manufactures rock drill bits: T51 Threaded Button Bit is the most important size for benching and long-hole drilling underground
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 drill rod, drifting drill steel heavy duty top hammer.