China T38 T45 T51 Drill Tube Mf Rods Extension Rod -
T38 T45 T51 Drill Tube MF Rods extension rod Extension rod, other names are Extension drill steel, Extension drill rod, and Extension steel, M/F rod ( Speed rod ) , Produce Hexagonal and round cross sections, Hexagon rods are more rigid, heavier and transfer energy more …
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