Had an extra unit not needed It?s never been used and screws still sealed for mounting Ideal Fit Size:The 6x12inch is the duct opening size,the overall size of this register is 13.27x7.28inch.Determine the correrct size by measuring the duct opening in the floor,do not measure your existing cover.Please make sure to match the size of the hole mouth size. Easy to Install: Installing this floor vent covers is a breeze thing, no tools required, just drop it into vent. You can enjoy a quick and straightforward setup to enhance the ventilation of your home. Classic Design: Our register vent cover is a classic louver design, with adjustable air supply lever, you can easily open the latch with a finger move.Clean lines and thoughtful design ensure air circulation is efficient and consistent. Superior Quality Material: Our floor register crafted from high quality steel with durable powder paint coated, with high robustness and long-lasting performance. Heavy duty floor vent cover to allow walk on use. Widely Used: This air vent covers widely used for floor vents, sidewall. And It can be used all around the home , office, work place, super market, etc. Available in a variety of styles and finishes to match any decor.