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Down-the-hole drill bit / with buttons - DuraRing475
This system can be used in all suitable conditions and be used in Foundation construction, Piling construction, Water Well and Geothermal, Tunneling and Horizontal drilling in a quantity of applications. This DURA RING gives all the advantage of DTH drilling-high capacity, drilling straight hole at any angle, easy to lock and unlock ring. It also offers DTH drilling a permanent ring bit system.