Tapered Drill Rods - Rock drilling tools | Button bits factory
A comprehensive range of taper button bits, cross bits and chisel bits with 6, 7, 11, 12 degree taper, drill hole diameter: 28mm-57mm. Product features: Carburization is a process used to harden the entire rod surface both internally and externally to strengthen and extend the life of tapered drill rod. To match tapered drill bits:
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