Drilling Standards Reference Guide
2015-3-2 · Drilling Standards Reference Guide. Imperial Units Metric Units C.D. = Core Diameter, O.D. = Outside Diameter, I.D. = Inside Diameter, *with coupling, **either/or Drilling Standards Reference Guide Bits Reaming Shells ... HQ 2.50 63.5 3.77 95.76 2.505 63.63 3.790 96.27
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