Very good performance well drilling bit, high downhole speed and long working life Payment terms:T/ ... ”)269.8mm(10 5/8”),295.3mm(11 5/8”)311.1mm(12 1/4”),346.0mm (13 5/8”),349 ... ,,617,627,637,737512,522,532,612,622,632,732Tricone bit 4 5/8"IADC537G