... T51-102MM, T51-127 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 ... °, 7°, 9°,11°, 12°.2. Type: flat bit, cross bit, button bit3. Main bit diameter: 30mm, 32mm, 36mm, 40mm 4.Package: ...