Notes: package contains 6 ceiling vent covers, if your duct hole opening width 3.8 to 4.25 and length 11.75 to 12.25, the grille cover size we recommend you to choose is 4* 12 inch; but the actual size you receive is a little larger( 5.7* 13.7 inch) , because the actual grille cover includes an extension frame for easy installing and conceal unwilling scratches; Please check the vent size of the air duct before purchasing, and a large quantity can meet the replacement demand Solid Metal Material: the floor vent covers are made of metal, with quality solid stamping steel structure, no wear powder coating, increased rust proof coating, no plastic, long service life, beautiful, durable and solid Simple Installation: each sidewall register vent cover is equipped with 2 screws, which can be tightly fixed on the ceiling, floor or wall by screwing the screws into the screw holes recessed on the side, and will not fall off, easy and labor saving to replace, suitable for being applied as an inlet vent cover to discharge bad air and odor to the outside, with good ventilation performance 3 Way Design: each of the house vent covers is featured with 3 way design, which is blown in 3 directions and adjusted manually; There is a manual adjustable smooth glide damper on the right side, and you can push the button up/down to adjust it Considerate Gift: the vent covers for home ceiling are not only suitable for personal use, but also suitable as considerate gifts for friends and family; They are easy to install, do not need additional tools, easy to clean and maintain with wet cloth Features: Air circulation in your house: This air conditioner register cover provides maximum air circulation throughout your living spaces. It reduces the occurrence of stuffy rooms, instead providing a fresh and well aired environment for you. Widely applied: This ceiling vent register can be widely applied to commercial and domestic use, fitting for restaurant, hotel, motel, library, market, living room, and more. Specifications: Material: mainly metal Color: white Size choose: 1. our grille cover size: 4*10 inch-------Your duct hole opening width: 3.8 to 4.25 inch, length : 9.75 to 10.25 inch 2. our grille cover size: 4*12 inch-------Your duct hole opening width: 3.8 to 4.25 inch, length : 11.75 to 12.25 inch 3. our grille cover size: 6*10 inch-------Your duct hole opening width: 5.8 to 6.25 inch, length : 9.75 to 10.25 inch 4. our grille cover size: 8*10 inch-------Your duct hole opening width: 7.8 to 8.25 inch, length : 9.75 to 10.25 inch 5. our grille cover size: 8*12 inch-------Your duct hole opening width: 7.8 to 8.25 inch, length : 11.75 to 12.25 inch Package includes: 6 x Ceiling vent covers Notes: The actual size you receive is a larger than title size,because the actual grille cover includes an extrension frame . The color may exist a slight difference due to different screen displays.