... drifting and Tunnelling rock tools made with high quality of best quality alloy steel bar and tungsten carbides, MAXDRILLThread button ... price . No matter what kinds of rock-Soft rock, loose-medium rock, hard rock and any other special formations, just tell ... T51, ST58, T60 Button bit face design: Flat face, drop centre, Normal and Retrac body. Tungsten carbide (Buttons): Spherical, ballistic and ...