Great British Steel: Each bracket is made from Galvanised steel in the United Kingdom. This provides strength, durability and a great level of rust-resistance. Powder Coat Finish: They are then powder-coated in a textured black finish. This provides additional robustness, as well as an eye-catching aesthetic. SleeperFit Promise: All SleeperFit railway sleeper brackets are all covered by a durability promise, we use these products ourselves and stand by their quality. Internal or External: They can be used both internally and externally. Install them inside a structure for extra strength at the corner. Use them externally for some added flair and decoration. External use also provides extra strength and durability if the corner was bashed into or knocked. Dimensions: Width: 100mm - Height: 100mm - Depth: 100mm, Manufacturer: Indoor Outdoors