... bit API& ISO 2,bit size 8 1/2 215.9mm 3,bit iadc code 517 4,bit rubber/journal sealed bearing 4,bit ... 1) Material: 15CrNi4MO2) Rubber/metal sealed bearing3) Jeurnal/rock bearing 4) Cutting element:hard alloy cutting tooth5) ... to soft-medium,medium-hard drilling information 6) Bit size:8 1/2"IADC code:5372,products details ... in you inquiry1)the size of the tricone bit.2)the IADC tooth model,like 537G3)plz ...