... :hard alloy cutting tooth5) Apply to soft-medium,medium-hard drilling information 6) Bit size:8 1/2"IADC code:5372,products details ... (6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 7/8”)212.7mm(8 3/8”),215.9mm(8 1/2 ... ”),222.2mm8 3/4”) 241.3(9 1/2”),244.4(9 5/8”),250.8(9 7/8”)269.8 ... (10 5/8”),295.3(11 5/8”)311.1(12 1/4”),346.0 (13 ...