Corten Steel Retaining wall With our range of retaining walls you can endlessly combine and almost any shape can be realised easily and quickly in your garden design. Retaining walls are made to order therefore never in stock. Delivery time is 3 weeks. A prefab system that is easy to install with the supplied fasteners. These retaining walls have a top edge of 50x25mm as standard. Extras: Varnish Rust accelerator