... high downhole speed and long working life 9 7/8" IADC537G is a regular types, we found ... ,76mm,93mm,95mm,98mm(3 7/8”), 114mm,118mm(4 5/8”),120mm(4 3/4”),127mm(5 ... .5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 7/8”)215.9mm(8 1/2”),222.2mm(8 3/ ... 4”) 241.3mm(9 1/2”),244.4mm(9 5/8 ... ”),250.8mm(9 7/8 ...