Aluminium Single 9 - CopperThe door threshold bars Aluminium Single 9 with a rounded profile Choose from nine attractive metal finishes The door threshold bars Single 9 is an elegant and secure way to join a carpet to a thinner floorcovering, such as vinyl, LVT, Amtico or bare floorboards. This design of door bar features a smooth, curved edge which slopes down from the carpet pile to the vinyl or floor boards. The two base floors should be level with each other as the Single 9