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Numa's range of the Super Jaws Under Reaming Bits are capable of drilling holes from 57?8 inches to 489?16 inches in diameter. Super Jaws is a special under reaming wing bit design made for simultaneously setting casing while drilling in unconsolidated rock formations of boulders and loose strata. The bits do not require the use of replacement ring bits that remain down the hole when drilling is complete. Numa
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