3" Garage Door Bottom Seal Weatherstrip：Garage door bottom weather seal 1/4" 'T' style in GREY,double 'T' style that measures 3" overall. The 'T' measures 1/4".Fits most Garage Doors .That Use a 1/4" or a 5/16" 'T' Channel Retainer The Role of Door Seals: Sealing - to prevent rain and dust from entering the car. Sound insulation and noise reduction-reduce wind noise and road noise during traveling. Cushioning and shock absorption-relieve the collision between the door and the car body. Thermal insulation-assists in maintaining the temperature inside the car Solve Common Problems: Replacement of new sealing strip can solve the following problems, sealing strip aging - hardening, cracking, deformation, loss of elasticity. Seal strips fall off - installation is not in place. Leakage of water or air, noise - sealing strip friction or dry Replacement Steps: Remove the old seal (tear it off slowly from the corners to avoid residual adhesive stains), clean the door frame, remove the oil and old adhesive, align the new seal, press and install it from one end to make sure it fits perfectly, and avoid closing the door vigorously or washing the car within 48 hours after installation Regular Maintenance: Regular Cleaning-Wipe the sealing strip with a damp cloth to avoid accumulation of mud and sand, Avoid Exposure to Sunlight-Prolonged exposure to sunlight will accelerate the aging process, try to choose a shady and cool place when you park your car Warm Prompt: Longer than ordered, can be easily cut to any length to fit the garage door desired size, please double check your existing garage door seal to see if it fits your garage before purchasing., Manufacturer: no