... rotary bit, high downhole speed and long working life 9 7/8" IADC537G is a regular types, we found it ... 4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149.2mm(5 7/8”)152.4mm(6”),155 ... (6 1/2”)190.5mm(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”)269.8mm(10 5/8 ...