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API matatu makoni zvishoma IADC537 11 5/8 ″ (295mm) yakaoma zvakanaka
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Kutenderedza tri-cone bit IADC537 12 1/4″(311mm)
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Simbi yakavharwa Kure Eastern dombo kuchera bit IADC537 13 5/8 ″(346mm)
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API tricone drill bit IADC537 14 3/4″ (374mm) yedombo rakaoma
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Tricone roller bit drilling IADC537 15.5 ″(393.7mm) yetsime rakadzika
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TCI drilling bit IADC537 16″(406.4mm)
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Tungsten Carbide Isa tricone bit IADC537 17.5 ″ (444.5mm)
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API & ISO tricone roller bit IADC537 26″(660.4mm)