1,bit API& ISO 2,bit size 8 1/2 215.9mm 3,bit iadc code 517 4,bit ... soft-medium,medium-hard drilling information 6) Bit size:8 1/2"IADC code:5372,products details 3,Packingor steel box4 ... ,532,612,622,632,7326,Payment termsT/T and L/C are acceptable.(30% advanced payment after sign the contranct ... plz add this formation in you inquiry1)the size of the tricone bit.2)the IADC tooth model,like 537G3)plz ...