By Default, We Will Ship The Goods To You Based On The External Measurement. The External Installation Size Will Be 6.4 Inches Larger Than The Size You Need (Details Are In The Measurement And Installation Method---Figure 3). If You Need Internal Installation, You Can Cut Off The Growing Part Yourself, Or You Can Send Us An Email When Purchasing To Inform Us That You Need Internal Installation, And We Will Ship It To You According To The Dimensions For Internal Installation. The Flood Protection Baffle Is Made Of Heavy-Duty, 4cm (1.5 Inch) Thickened Aluminum Panels And Aluminum Columns, With An Oxidized Surface For Added Durability. Surrounded By Ip6-Rated Abs Rubber Strips, It Provides Reliable Partitioning And Flood Protection, Preventing Damage Caused By Severe Weather Both Indoors And In Dry Areas. If You’Re Concerned About Floods Or Heavy Rains Damaging Your Garage Or Interior Spaces, And Other Flood Control Devices Have Proven Ineffective, Our Heavy-Duty Flood Control Barriers Are The Perfect Solution. They Can Be Used Repeatedly And Offer Up To 98% Waterproof Protection, Making Them Highly Effective In Flood Prevention. The Panels Are Designed With Concave And Convex Splicing, Featuring An Abs Rubber Strip To Enhance Sealing. The Bottom Is Equipped With A 2x4cm (0.7x1.5 Inch) Thickened Rubber Strip, Which Increases Ground Friction And Seals Gaps To Prevent Water Penetration. This Durable System Remains Effective For 5-8 Years, Making It Ideal For Both Residential And Commercial Use. Each Panel Is Easy To Remove And Reinstall, Allowing Normal Access When There’S No Risk Of Flooding. Installation Is Simple, Requiring Only Two Adults And About 10 Minutes To Assemble, Ensuring A Fast And Efficient Flood Control Setup. Dam Easy Flood Barrier