T51 127MM Retractable Button Drill Bit , Retract Rock ...
T51 127MM Retractable Button Drill Bit, Retract Rock Drilling Bit Button bit is well known for its high wear resistance on medium-hard to hard abrasive rock formations (between 200 Mpa to 260 Mpa compressive strength). Featuring spherical tungsten carbide inserts that is known to have strong configuration against carbide fracture.
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