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Rc range. the halco reverse circulation (rc) product range has been designed to give maximum performance in exploration and grade control applications. unlike standard dth hammers, rc hammers return the rock cuttings back to the surface through the internals of the hammer …
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Oct 13, 2010 · point styles are another consideration. the bullet type points are handy for thin metal. many prefer a 135 degree point. in sizes above 1/2" or so i figure to be sharpening that bit as needed; so the initial grind doesn't matter much to me -- 119 degrees is fine.
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