Features: Versatile Application: These 7" x 18" door glass replacement insert compatible inserts can be applied to refresh existing glass doors or add light to solid doors. The pre-assembled frame-and-glass unit simplifies installation, while the durable plastic frame resists warping and discoloration over time. For new installations, a 9 1/2" x 20 1/2" door opening is recommended. Glass for Energy Efficiency: The included door glass panel is equipped with Low-E technology, providing enhanced energy efficiency. This helps to reduce heat transfer, keeping your home cooler in the summer and warmer in the winter, while also offering a view through the 7” x 18” entry door glass insert. Specifications: Material: glass, plastic Color: white Size: The outer frame dimension about 9 1/2" x 20 1/2" (+/-0.25") The door glass about 7" x 18", fits for doors with a thickness of 1-3/4 inches Package includes: 1 Lite door glass 1 x Molded plastic frame with screws and screw covers Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays. If staining is required, first apply a primer, then use a gel stain followed by two coats of clear polyurethane finish Installation Tip: For easy setup, this frame comes with pre-applied adhesive,Just screw it into place—no extra caulk is needed. If you choose to apply extra sealant for added security, you must use a neutral-cure silicone.Acidic silicone will corrode the factory adhesive, causing it to break down. Please always confirm the compatibility of the adhesive you are using before application