... drill bit ISO9001 &14001 high quality and the lower price OEM or produce according to your request best service 7° taper drill ... 127 etc.3. Button bit face design: Flat face, drop centre, Normal and Retrac body.4. Tungsten carbide (Buttons): Spherical, ... ballistic and Conical. (Threaded R32, R38, T38, T45, T51, bit diameter: 45mm-127mm);Tapered ...