Very good performance three cone rotary bit, high downhole speed and long working life 9 7/ ... .3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”),149.2mm(5 7/8”)152.4mm ... 1/2”),244.4mm(9 5/8”),250.8mm(9 7/8”)269.8mm(10 5/8”),295.3mm(11 5/8 ... ,627,637,737512,522,532,612,622,632,7323 cone rotary bit 4 5/8"IADC537G