The FT-1503-MD Flush Tray accessory is specifically designed for flush mounting of the Metal Door model only. It is mounted directly onto the RiS housing and installed with the RiS housing. Constructed of stainless steel sheet, this accessory is powder coated black. It can be used in poured concrete or block construction, as well as drywall IC and non-IC walls. The Flush Tray can be adjusted for 1/2" thick or 5/8" thick finished wall surfaces. The FT-1503-MD is provided with drywall mounting flanges (2) for direct nailing into framing, or concrete pour plates and mounting hardware.