Clamp-On Frame Interior Window -18 " Shelf remove
Description: Part Number: CO1W18A 
Satin Anodized Aluminum Clamp-On Frame Interior Window -12 Inch Shelf and Deal Tray.
Clamp-On Style Frame Easily Clamps on to Wall Opening, Surround Sound System Allows Natural Voice Transmission -18 inch (457 millimeter) stainless steel shelf, Frame accommodates walls from 5 to 8-1/2 inches (127 to 216 millimeters) thick. Unit easily slides into the wall opening. Made In The USA.