... ? Answer : Yes. All our activities are certificated by ISO and API, we have many regular customers in many countries and regions ... ”),155.5mm(6 1/8”),158.7mm(6 1/4”), 165.1mm(6 1/2”)190.5mm(7 1/2”),193.6mm(7 5/8”),200.0mm(7 ... (26”)Available models: Steel tooth(IADC)111, 121,131117,124,126,127,136,137 216,217, 227211,311TCI(IADC)415,435, 417,437515 ...