We have triangle keel A and triangle keel B for the plane ceiling of 600 x 600 mm and 300 x 300 mm. The triangle keel can hang the ceiling close. Thinkness: 0.30mm, 0.34mm Perimeter of the cross section:86mm, 100mm. Length: 3000mm, 6000mm, or any length you order Dont hesitate to contact us if this product meet your need. Material galvanized steel