... or as request2.Drive type: Phillips, Pozi, Square, Torx, Single, Double3.Material: Brass, Low Carbon Steel, Alloy Steel, ... , please contact with us at onceSurface treatmentPassivation,Chromium-Plating,Black, Zinc-Plating,nicklel plated,HDG ,black or as request3.) NameSlotted ... brass, alloy, Aluminum, etc.FinishZimc plated(Cr,3+);zinc plated(Cr,6+); hot dipped galvanized;dacromet;nickle plated plain ...