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This shaft is made from steel for a 7.0" pump extension, it has a 7/16" drive hex.
RCD fuel pump drive shafts are machined from Turned Ground & Polished steel or titanium and gun drilled through the center. The driven end has a male 5/8" hex and the drive end has a female hex broached on center, available in 3/8", 7/16" or 1/2". Heavy duty shafts are available without gun drilling.