GINCHAIN Universal T Garage Door Bottom Weatherproof Seal and Pre-Drilled Retainer Kit. Easy installation, great for steel or wood roll up doors. This retainer can be used in the bottom of many sliding doors, entry doors and other types of garage doors Garage Door Weather stripping & Accessories: The package includes 5 x 3.35 ft T sandblasting aluminum retainer track (totally 16.5 Feet), 1 x 16.5-feet long U+O ring shape design weather seal, 1 x screw kit. The aluminum rails and seals are longer than the data length to ensure you have more room for adjustment and you can cut the length as needed Upgraded Performance: On the basis of the traditional garage seal, adjusted the size of the seal slot to make the installation process easier, U+O ring shape design can better block dust and garbage from entering the garage. Use EPDM rubber instead of PVC for better processability, low temperature properties and compression. Guard your garage at all times, even in extreme temperature conditions (-40 to 240 F) Installation Tips: Cleaning the bottom of the garage door before starting the installation, pre-drill rail can be easily fixed to the bottom of the garage door with screws.