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Thread Rolling Die Flat Thread Rolling Die Screw Rolling Plate. DC53 HSS high speed steel high toughness crack resistant long wearing. Vacuum heat treatment optional TiN AlCrN coating greatly improve wear resistance reduce mold change downtime. Wide Compatibility For self tapping screw drywall screw drill tail screw bolt Metric UNC UNF standard available. Stable Mass Production Easy machine adjustment, high consistency for large volume fastener production improve working efficiency. Direct Factory Supply Professional technical support fast delivery.