... soft-medium,medium-hard drilling information 6) Bit size:8 1/2"IADC code:5372,products details 3,Packingor steel box4,we ... ”),161.9mm(6 3/8”),165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 7 ... 3/4”)381(15”),393.7(15 1/2”),406.4(16”)444.5(17 1/2”),508(20”),558(22”),609.6(24 ... 537G3)plz tell the drilling information of the layer.4)plz tell the quantity. 8 1/2 215.9mm iadc 517 drilling rig ...