Hamilton Sinkler Decorative Cast Bronze Dome Vent Floor Register - 10x2-1/4in. (Bronze Patina) HAM-HVD-210-BP This solid cast bronze dome vent floor register (with damper) combines beauty and character with rugged dependability and functionality. Faceplate made of over 1/8 of solid cast bronze. There are no holes on the face plate so simply drop into place. 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 floor itself.