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Model NO.: 4-1/2 pin - 6-5/8 box Usage: Well Drilling Machinery, Offshore Oil and Gas Field Exploitation Machinery, Oil and Gas Transportation Machinery, Oil and Gas Processing Machinery, Oil (Gas) Production Machinery Type: Petroleum Drilling Tool & Accessory Certification: ISO, CE Trademark: solidkey Specification: API Spec 7 & ISO 9001: 2008