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T38 Rock Drill Mining Drill Rod R22 R25 R28 R32 R35 R38 T38 T45 T51 GT60 ST58 ST68 Threaded Rock Drill Rods For Mining Tunnelling Blasting. ... China supplier R25 R38 T38 T45 T51 GT60 retrac thread rock button drill bits. US 10.00-150.00 Piece. 1.0 Pieces (Min. Order) 4 YRS Changsha Wontech Engineering Machinery Co., Ltd. 100.0%.
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