T51 Threaded Button Bits are the most important size for benching and long-hole drilling underground, manufactured by Rock Drilling Tools factory ProDrill.

Diameter: 76mm, 89mm,102mm

Skirt body design: retrac, and normal, straightrac

Face type: flat, uniface, Drop Centre

Carbide shape:  Dome, ballistic, semi-ballistic/parabolic

This type of rock drill bits used in bench drilling, underground long hole drilling to match extension Male Female rod, Male Male rod heavy duty top hammer.

15 dome carbide inserts T51 threaded drill bit with flat face design, 102mm diameter match with T51 extension drill rod for bench drilling and lone hole drilling underground.