China T38 T45 T51 Speed Extension Rods for Hole Drilling ...
MF Rod T51-Round52-T51, length 6 12 14 20 ft MF Rod ST58-Round60-ST58, length 12 14 20 ft For Extension Rod and M/F steel process, the below two different types of heat treatment are used to strengthen high speed and powerful percussive drill string components to maximize their performance and reliability.
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