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API cones atọ bit IDC537 11 5/8"(295mm) maka olulu mmiri siri ike
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IDC537 12 1/4 ″ (311mm) na-atụgharị
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Igwe mkpọpu igwe dị n'Ebe Ọwụwa Anyanwụ Ụwa IADC537 13 5/8 ″(346mm)
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API tricone drill bit IDC537 14 3/4" (374mm) maka nkume siri ike
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Tricone roller bit drilling IDC537 15.5"(393.7mm) maka olulu mmiri miri emi.
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TCI mkpọpu bit IDC537 16 ″ (406.4mm)
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Tungsten Carbide Fanye tricone bit IDC537 17.5 ″ (444.5mm)
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API & ISO tricone roller bit IDC537 26″(660.4mm)