... , galvanised wire, mild steel, phosphor bronze, brass.ShapesHelical, conical, barrel, hour-glass.EndsOpen, closed & ground, closed & unground. Finishing ... processesTempering, scragging, de-burring, barrel rumbling, shot-peening available as required.FinishesZinc/colour passivates, black ... . Compression Springs sus 304 stainless steel helical compression spring