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Door Thresholds/Saddles. Browse our huge variety of high quality commercial grade aluminum and bronze door thresholds in a variety of styles and sizes. Threshold are applied to doorways to insulate the gap between door and floor or to create a transition between two floor surfaces. Many of our thresholds qualify for our QuickShip and EasyReturns Program, select link to view. For an in-depth look at installation, make sure to read Smart Installation. Flat Utility 85.