Very good performance three cone rotary bit, high downhole speed and long working life 9 ... 118mm(4 5/8”),120mm(4 3/4”),127mm(5”)133.3mm(5 1/4”),139.7mm(5 1/2”),142.8mm(5 5/8”), ... 149.2mm(5 7/8”)152 ... 250.8mm(9 7/8”)269.8mm(10 5/8”),295.3mm(11 5/8”)311.1mm(12 1/4”),346. ... 627,637,737512,522,532,612,622,632,7323 cone rotary bit 4 5/8"IADC537G