Type TCI(Tungsten Carbide Insert) tricone bit IADC CODE Available 417 427 437 517 527 537 617 627 637 737 837 832 415 425 445 525 625 635 416 427 436 446 447 516 526 537 547 516 536 535 Available sizes: 3 3/4" (95mm), 4 1/8â??(105mm), 4 1/4"(108mm), 4 3/4â??(121mm), 5 5/8"(143mm), 5 7/8â??(149mm), 6â??(152mm), 6 1/4"(159mm), 6 1/2"(165mm), 6 3/4"(171mm), 7 1/2"(190mm), 7 7/8â??(200mm), 8 1/2â??(216mm), 8 3/4" (222mm), 9 1/2â??(241mm), 9 5/8"(245mm), 9 7/8"(250mm), 10 5/8"(269mm), 12 1/4"(311mm), 14 3/4"(348mm), 17 1/2"(445mm) Application formations Soft ,medium soft ,hard,medium hard,very hard formation Material Body: Alloy steel Tooth marterial: Tungsten carbide insert(TCI)