... medium-hard drilling information 6) Bit size:8 1/2"IADC code:5372,products details 3,Packingor steel box4,we ... (6 3/8”),165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm( ... 8”)311.1(12 1/4”),346.0 (13 5/8”),349.2(13 3/4”)374.6(14 3/4”)381( ... 15”),393.7(15 1/2”),406.4(16”)444.5(17 1/2 ... in you inquiry1)the size of the tricone bit.2)the IADC tooth model,like 537G3)plz tell the ...