Cast Iron Door Knocker Handcrafted Cast Iron Door Knockers. Suitable for most front doors, wooden doors, garden shed, fences and makes a perfect gift for new homeowners.  Knocker handles are very suitable for front doors, gates, wooden doors, garden shed fences, and can also be used for feng shui, good luck, decoration, holiday gifts, etc. Ungalvanized iron can be sprayed in any colour finish. To prevent rust, use wax to protect. If rusted, use steel wool and then wax or soak it in white vinegar. Dimensions: 13 cm (L) x 9 cm (W)