This Louvered style register is finished in a fine matte black and is constructed from durable iron. Outer Diameter: 14 Inches (356 mm) by 8 Inches (203 mm). Comes With Louvers. Drop In Style Standard. These are individually cast in solid iron - durable and heavy for decades of service. The cast iron is approximately 0.2 inches thick (5 mm) and will easily hold over 400 pounds.