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30/50/22mm Auger Teeth Rock Drilling Tool Rock Bits for Rotary Drilling Rig (B47K22H), Find Details and Price about Engineering Bullet Teeth Bullet Teeth from 30/50/22mm Auger Teeth Rock Drilling Tool Rock Bits for Rotary Drilling Rig (B47K22H) - Chuanyan Drilling Tools (Shandong) Co., Ltd.