... size 8 1/2 215.9mm 3,bit iadc code 517 4,bit rubber/journal sealed bearing 4,bit ... drilling information 6) Bit size:8 1/2"IADC code:5372,products details 3,Packingor steel box4,we ... 137 211,311216,217, 227TCI(IADC)415,435, 417,437515,525,535,545, 517,527,537,547615,625,635 ... )the size of the tricone bit.2)the IADC tooth model,like 537G3)plz tell the drilling ... the quantity. 8 1/2 215.9mm iadc 517 tricone bit