5-Hole 2-Way Channel Wing Connector - Electro-Galvanized allows channels to be connected perpendicularly and can be used to create joints along a vertical piece of strut. 5-Hole 2 Way Wing Fittings allow for 2 arms to be created from the corner wing fitting at a cross. The Corner Fittings have 9/16" punched holes and should be used with like metals. Electro-Galvanized Steel should be used in interior applications where conditions are dry, and humidity is low.