... good performance three cone rotary bit, high downhole speed and long working life 9 7/8" IADC537G is a regular types, ... 7 days, to East-south Asia is always less than 15 days.3.Can I expect a quality ... sizes: 60mm,65mm,76mm,93mm,95mm,98mm(3 7/8”), 114mm,118mm(4 5/8”),120mm(4 ... 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 7/8”)215.9mm(8 ... 3/4”) 241.3mm(9 1/2”),244.4mm(9 5/8”),250.8mm(9 7/8”)269.8mm(10 ...