... type and retrac type2) Bit diameter: 32mm-127mm3) Bit face shape: flat face and drop centre4) Tungsten carbide (Buttons): spherical, ballistic ... of the Bit Diameter,No.air holes,carbide button shape and the face shape.II. Rock Drill Bits Classifications And Applications: 1 ... hammer, speed and life and high, cut out of a round shape.III. FACE and BUTTON designs for our products:Button bit ...