12" x 12" 3-WAY SUPPLY GRILLE - DUCT COVER & DIFUSER - Flat Stamped Face 12"w X 12"h Is The Size For The Duct Opening Measurement Only, Actual Front End Outer Dimensions Are 13.75" Width X 13.75" Height - SEE BELOW IN DESCRIPTION HOW TO MEASURE A GRILLE High Quality Solid Stamped steel with Counter-Sunk Screw Holes (Screws Included) and No Sharp Edges Carefully Shrink Wrapped With Cardboard Backing To Prevent Damage In Shipment Easy Unrestricted Air Flow For Your HVAC System Powder-Coat Finish - Smooth, Shiny, Scratch-Resistant, Beautiful. Looks Like It Was Just Waxed