4 inch RC Drilling Reverse Drill Bits with Tungsten Carbide Material Forging Type

4 inch RC Drilling Reverse Drill Bits with Tungsten Carbide Material Forging Type 4' 4inch Reverse Circulation (RC) Drilling Bits 115 with 4inch RC drilling hammer for mining Exploration Introduction HRC series reverse circulation DTH Hammer is the latest developed products of our company. It is mainly used for deep exploration drilling and stope ore grade control. This reverse circulation drill bits are widely used in the following applicaiton field: Geologic exploration