Daltile Windowsills and Thresholds 4" x 36" Polished Marble 5/8 Double Bevel Threshold provides a sophisticated transition with its double bevel design. This 4" x 36" polished marble threshold adds a touch of luxury to any space, whether in doorways or as part of a windowsill installation. The polished marble surface offers both beauty and durability, making it ideal for high-traffic areas. This threshold is the perfect way to create a seamless, elegant transition between rooms while ensuring long-lasting performance and visual appeal.