CIR90 Low Air Pressure DTH Drilling Tools for Construction DTH bit is our main product. After many years searched, we have rich experience in development and manufacturing high quality products, which adopted high-quality raw materials, advanced technology and passed through strictly inspection. 1.high and low air pressure down-the-hole drill bits 2.Low air pressure hole Dia.:65-220mm 3.Face type: drop center / concave / convex / double gauge / flat

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Xiamen Bestlink Factory Price RC4.5 RC5.5 Remet or Metzke Thread Connection RC Drilling DTH Hammer Bits for Geological ExplorationReverse Circulation (RC) drilling is used to collect mineral and rock samples quickly and efficiently using a large rotary drill and air compressor. Reverse Circulation (

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