... medium hard,very hard formationButton size (extra features)Button bit,saw teeth1) Y-Conical teeth 2) ... wide teeth4)G- Gague protectionMaterialAlloy steel ,carbidePackingWooden case or steel casePayment termsT/T,L/C,Western ... bit,down hole opener,hole enlarger,drag bit,button bit and drilling equipment for petroleum&gas ,water ... 174.63 3/4-6 7/8294-53980-40Contact information TCI Bit 165 mm with 3 1/2" REG ...