... and shapes of steel channels are available Ceiling Channel for ceiling system 1. Supporting channel: 38 x 12mm, 30 x 27mm, ... 50 x 12mm, 50 x 15mm, 60X27mm 2. Covering channel ... 7mm, 2. 8mm, 2. 9mm, 3. 0mm 4. Supporting channel: 0. 5mm, 0. 6mm, 0. 8mm, 1. 0mm, 1 ... . 2mm 5. Covering channel: 0. 35mm, 0. 4mm, 0. 45mm, 0. 5mm, ...