MSI White Double Beveled 4 in. x 36 in. Polished Engineered Marble Threshold Tile Trim (3 ln. ft./Each) THD2WH4X36DB - The Home Depot
Carrara Bianco Marble One High Beveled Door Threshold (Marble Saddle)
Threshold.Shop Italian White Carrara Marble Threshold Double Bevel for Floor Transitions (4" x 24") - Amazon.com
Amazon.com: Tenedos Carrara Marble One High Beveled Single Hollywood Doorway Floor Threshold (Marble Saddle) -Polished (6" x 36") : Clothing, Shoes & Jewelry
White Carrara Marble Threshold - 4" x 36" Double Bevel Polished — Stone & Tile Shoppe, Inc.