MSI Gray Double Beveled 4 in. x 36 in. Polished Engineered Marble Threshold Tile (1 sq. ft./Each) THD2GR4X36DB - The Home Depot
Amazon.com: Tenedos Carrara Marble One High Beveled Single Hollywood Doorway Floor Threshold (Marble Saddle) -Polished (6" x 36") : Clothing, Shoes & Jewelry