Hamilton Sinkler Decorative Cast Bronze Wall Register - 6x6in. (Bronze Patina) HAM-WVF-606-BP This solid cast bronze flat wall mounted register (with damper) combines beauty and character with rugged dependability and functionality. Faceplate made of over 1/8 of solid cast bronze. Comes with two countersunk holes and screws for mounting on the wall. Louvers are attached with machine screws so no duct tape is required. Comes in a beautiful dark distressed bronze patina finish. To determine the size of register you require, measure the opening duct in the wall itself.