Can I install letterbox numbers on a metal letterbox?
Yes - the included 3M VHB tape bonds well to metal letterbox faces, making it ideal for this exact situation.
Note that the rod and spacer fixing system used with our custom numbers and letters is generally not suitable for metal letterboxes, so if you're fixing to a metal letterbox, our letterbox numbers with adhesive tape [or an epoxy adhesive with a flush mount] are the way to go.