A quality cast iron French 19th century door knocker in original condition. It's small and very light (270 g), so will fit a small doors. It can be fixed with two ordinary black screws (these are not in the set, but your builder will have them), so you don't have to drill the holes through your doors.

The dimensions of the knocker: height 20 cm (7.8"), width 6.5 cm (2.5"). The distance between the screw holes: 13.5 cm (5.3").