A collar is a decorative ring or sleeve that wraps around a baluster or picket bar, typically placed at the point where two different bar profiles meet or to cover a weld joint. Collars add a finishing detail that conceals connections and adds the appearance of hand-wrought quality to a fabricated piece.
A base shoe is a decorative cast iron piece that sits at the floor or bottom rail and surrounds the base of a baluster or picket. It hides the installation hole or weld point and creates a neat transition between the metal component and the floor or rail surface.
Yes, with proper finishing. Cast iron holds primer and paint well. For outdoor use, coat with a rust-inhibiting primer followed by an oil-based or powder coat topcoat. Inspect periodically for paint chipping, particularly in crevices, and touch up promptly to prevent rust.