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Ngā mata keri API IADC537 5 5/8″ (142.9mm)
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Ngā mata keri tungsten carbide tere teitei IADC537 5 7/8″ (149mm)
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Ngā mata kōhatu Tricone IADC537 6 inihi (152.4 mm)
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Mata tricone hurihuri IADC537 6 1/4 inihi (159 mm)
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Ngā mata kōhatu tricone TCI IADC537 6 3/4″ (171mm)
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Pātene API IADC537 6.5 inihi (165mm) me te utu whakaheke
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TCI moka toka IADC537 7 1/2” (190 mm)
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Momo tricone API wheketere IADC537 7 5/8” (193.7 mm)
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TCI tricone bit IADC537 7 7/8 inihi (200 mm)
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Momo Whakauru Tungsten Carbide IADC537 8 1/2″(215.9mm)
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Mata wiri pātene API IADC537 8 3/4″(222.2mm) me te utu whakaheke
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Mata keri TCI IADC537 9 1/2″(241mm) mō te puna hinu toka mārō