China R38 T38 T45 T51 Speed Rod, Mf Rod,
R38 T38 T45 T51 Speed Rod, Mf Rod, Extension Rod Drill Bits Coupling Drilling Tool Produce Hexagonal and round cross sections, Hexagon rods are more rigid, heavier and transfer energy more efficiently, while increasing flushing. Round rods are generally lighter than hexagonal rods and are normally used in extension drilling applications.
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