... hard,medium hard,very hard formationButton size (extra features)Button bit,saw teeth1) Y-Conical teeth 2) X- ... reamer bit,down hole opener,hole enlarger,drag bit,button bit and drilling equipment for petroleum&gas ,water well ... softSoft Marl, Clays, Sands, Salts etc.1187.3~346.17 3/8~13 5/8441~735120~50softClays, Soft Shale ... 2-174.63 3/4-6 7/8294-53980-40Contact information TCI Bit 165 mm with 3 1/2" REG ...