ST58 Threaded Button Bits are the most important size for benching and long hole drilling underground, this type of rock drill bits manufactured by rock drilling tools factory ProDrill.
Diameter: 89mm, 93mm, 102mm, 115mm, 127mm
Skirt Body: retrac, and normal, straightrac
Face type: flat, uniface, drop center
Carbide Design: Dome, ballistic, semi-ballistic
Used in bench drilling, underground long hole drilling
To match extension MF rod, MM rod heavy duty top hammer.
Features:
18 Dome/Semi-ballistic carbide inserts ST58 Threaded drill bits with flat face design, 89 mm diameter with extension rod for heavy duty drilling.
A look inside of ST18 threaded button bit.
For more details please watch PDF online: ST58 Drill Bits for Bench Drilling, Long Hole Drilling Underground Catalogue