Very good performance three cone rotary bit, high downhole speed and long working ... by Middle East, North America, South America, Western Europe etc. so it is a regular size ... 30 days, South Afria 35 days, Western Africa 60 days. To Western South America about 30 ~ 35 days, ... to Western Southh America 40 days, e.g. Santos ... 612,622,632,7323 cone rotary bit 4 5/8"IADC537G