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Components Aluminum housing with mesh rolled Aluminum pulling girder Aluminum Rail with revolvable hard-wool brush Accessory Unit Benefits—Never Slam 1. Horizontal Retractable Screen door Assembled with Patented Brake which makes the retraction much smoother. The pulling girder end-cap can slide along the special rail , wherever you handle the pulling girder to put the screen out or back, the pulling girder never slam. 2. Strong Special Connector for Double Horizontal Retractable Screen Door won’t pop out. 3. The installation for double retractable screen door is absolutely the same with the single style installation which can save you much time. 4. Wider top guide rail keeps the mesh clutched and makes strong wind proof function; lower bottom guide rail makes ideal access. 5. Pretty extruded aluminum Housing completely decorates the exist opening