1.ISO9001&IADC API tricone bit 2.do tricone bit OEM,6 inch etc 3.steel tooth &TCI tricone bit 4.rock bit superme quality 8 1/2 inch API tricone bit/TCI tricone bitSizes and types available: Size: Common sizes, 6.6-1/2, 7-7/8, 9-7/8, 10-5/8, 12-1/4 Various sizes also can be made to order. Types: IADC Code, 412, 432, 532, 612, 632, 712, 732, 832 etc.Notes:Non standard items also can be made as your ...