Developed to meet the need for a more productive and longer lasting rotary drill bit, Sandvik RR221 is the latest update in the complete rotary blasthole bit range from Sandvik. Through comprehensive ...
Most raise boring applications begin with the drilling of a pilot hole. The general length of a pilot hole varies from 30 – 1000 meters, with standard drill pipes of 1.5 meter length. The time and ...
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