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Two-piece Bit Design
August 1, 2001
The Impact Ring Bit System from Numa provides a way to simultaneously drill and case holes in either horizontal or vertical rock drilling applications. The system consists of a down hole hammer and a unique two-piece bit design which incorporates a center and ring bit combination for drilling 5.25- to 48-inch diameter holes. In horizontal applications, an auger also is fitted onto the back end of the hammer to promote more efficient cleaning of the hole during drilling. Numa
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