The Best Drill Bits for Stone
For very heavy duty drilling through stone and rock, USA Rock Bit Inc. makes the USA Heavy Duty Reverse Circulation Roller Bits such as the 17-1/2 inch Four-Cone Welded Hole Opener. A degree of customization is available at this specialized end of the market. The Four-Cone Welded Hole Opener can be fitted with medium formation mill tooth cutters.
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