... in special fastener 1,Name:Metal step ferrule;step ferrule;metal ferrule 2,For the similar ferrule,what can we do ?(1), Ability ... for the material of this kind of ferrule: Grade3. ... ,C27200,etcBronzeC51900,C60600,C17200,etcAlumimum100,5052,6061,6063,etc(2),Ability for the surface finish: ElectroplateZinc plated(while,colour ...