Hydra-Drill - Deep Rock Manufacturing
2013-4-29 · The smaller Hydra-Drill packages will drill a 4 inch ( 100mm ) bore hole designed for a 2 inch ( 50mm ) casing. The larger packages will drill up to an 8 inch ( 203mm ) bore hole for a 6 inch casing. The rule of thumb is to drill a 2 inch larger diameter bore hole than the diameter casing you plan to use.
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