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215.9mm 8 1/2 Inch PDC drill bit steel body rock bit gas well fixed pdc blade coring drilling tool for oil well drilling

215.9mm 8 1/2 Inch PDC drill bit steel body rock bit gas well fixed pdc blade coring drilling tool for oil well drilling

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Good Quality 10 5/8inch 269.9mm 4 blades steel body PDC bit used for drilling water well

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