Stainless Steel Concreate Wall Electrical Boxes Posted by SMI on July 7, 2015 Posted in: Fabrication. Leave a comment Working on these for a customer of ours. They will be incased in concreate and a light fixture will be wired into them. A snippet of the plans so you can get a better idea. Share this:TwitterFacebookLike this:Like Loading... Posts navigation ← Messer 400amp Plasma Torch Mass Production? No Problem. →