2-Hole Adjustment Angle 1-5/8" x 2-5/8"- Electro-Galvanized fittings connect strut channel at the corners and joints. If you are looking to join channel sections using angle fittings with adjustable angles use channel nuts, bolts, nuts, and washers to join the fitting to the channel. Electro-Galvanized Steel should be used in interior applications where conditions are dry, and humidity is low.