... (8 1/2”),222.2mm(8 3/4”) 241.3mm(9 1/2”),244.4mm(9 5/8”),250.8mm(9 7/8”)269.8mm(10 5/8 ... ”),295.3mm(11 5/8”)311.1mm(12 1/4 ... ”),346.0mm (13 5/8”),349.2mm(13 3 ... ,,617,627,637,737512,522,532,612,622,632,7323 cone rotary rock bit 4 5/8"IADC537G