130mm 5 1 8 rc bits

... utilizes double drill rods where air is passed down the hole through the outside annulus and into the hammer. Drill cuttings are cleared from the bit by the air and travel up through the centre tube of the drill rods remaining free from contamination....

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... drilling and ore grade control. The use and the advantages of the R.C. DTH Hammer I) No Contamination The R.C. System collects sample through the recovery holes in the face of the drill bit immediately as the cuttings or sample is...