1,bit API& ISO 2,bit size 8 1/2 215.9mm 3,bit iadc code 517 4,bit rubber/journal sealed bearing 4,bit FOB ... tooth5) Apply to soft-medium,medium-hard drilling information 6) Bit size:8 1/2"IADC code:5372,products details 3 ... /4”)381(15”),393.7(15 1/2”),406.4(16”)444.5(17 1/2”),508(20”),558(22”),609 ... this formation in you inquiry1)the size of the tricone bit.2)the IADC tooth model,like 537G3)plz tell the ...