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,we can provide ... more size 5,size and model we can provide 60mm, ... ”),161.9mm(6 3/8”),165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 ...