Amazon.com: Tenedos Italian Carrara White Bianco Greyish Marble One High Beveled Single Hollywood Doorway Floor Transition Threshold Tile (Marble Saddle) -Polished (4" x 36") : Clothing, Shoes & Jewelry
MSI Gray Double Beveled 4 in. x 36 in. Polished Engineered Marble Threshold Tile (3 ln. ft./Each) THD2GR4X36DB - The Home Depot
Bardiglio 6x60 Marble Door Threshold Saddle
Marble Door Thresholds: The Advantages Compared to Popular Alternatives
4 x 24 Threshold Saddle | White Grey
4 x 32 Saddle Dark Grey | Threshold
Super Grey Quartz Polished Saddles (Multiple Sizes Available) – ProcidaTile