... Long-life, 2.High penetrability. 3.Can match many famous drilling machine, such as Atlas Copco, Sandvik, In We are a professional ... bits with high, medium and low air pressure, symmetric drilling tools, eccentric drilling tools, standardized API system casings, bit shanks and ... 40mm,42mm,44mm Thread Drill Bits---Diameter: 51mm to 127mmThread Type---R22,R25,R28,R32,R38,T38,T45,T51Face Shape---Plate ...