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Specification: 4-1 / 2 "5" 5-1 / 2 "6-5 / 8" 7 "7-5 / 8" 8-5 / 8 "10-3 / 4" 11-3 / 4 "13-3 / 8" Steel grade: K55 Buckle type: STC short round casing coupling Main parameters: This product complies with API 5CT / 5B standard.
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