... 20 years history Milled Tooth Rock Roller Bits: 7 7/8 to 14 1/2 ModelTCI BIT, STEEL TOOTH ... unionDelivery termsBy sea or by airDelivery timeWithin 3 to 7 daysMarketCanada, USA,Middle east ,Africa,Europe Hejian ... tricone bit,tungsten carbide insert rock bit,tri-cone drill bit ,3 cone bits,rotary bit, TCI ... tricone bit,PDC drill bit ,diamond core bit,bicenter bit,single cone ...