Raise Borer, Raise Boring Machine manufacturer / supplier in China, offering Hunan Yier Mining Technology Produce at-4000L Raise Borer Used for Creating Ventilation Shafts, Ore Passes, Drainage Systems, and Civil Engineering Projects, High Performance Raise Borer at-4000L for Deep, Large-Diameter Drilling in Varied Rock Conditions, Hunan Yier Technology at-4000L Designed for Holes Ranging From 1.0m to 4.0 M in Diameter Raise Borer and so on.