Rock Bit, Button Bit, Chisel Bit manufacturer / supplier in China, offering 30mm~60mm Tapered Chisel Drill Bits, Chinese Made Tapered Chisel Drill Bits, 36mm, 40mm, 42mm 6 Buttons 7degree, Insert Rock Drill Bit and so on.
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our 34mm 8buttons 12degree can drill 80 to 100 meters on granite,very hard rock type.
customers are satisfied.