Black Iron Register - Measures Inner Diameter: 10 Inches (254 mm) by 8 Inches (203 mm). Outer Diameter: 12 Inches (305 mm) by 10 Inches (254 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.
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Hand Cast Iron for Decades of Service Antique Hardware Tips