... rotary bit, high downhole speed and long working life 9 7/8" IADC537G is a regular types, we found it ... Austrilia is about 30 days. To Japan is about 7 days, to East-south Asia is always less than ... (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/ ...