... Yes. All our activities are certificated by ISO and API, we have many regular customers in many countries and regions ... ,98mm(3 7/8”), 114mm,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 ... models: Steel tooth(IADC)111, 121,131117,124,126,127,136,137 216,217, 227211,311TCI(IADC)415,435, 417, ... 637,737512,522,532,612,622,632,7323 cone rotary rock bit 4 5/8"IADC537G