Aluminium Double Z - BrassThe carpet threshold Aluminium Double Z delivers quality and style Choose from 9 finishes to complement your carpet The carpet to carpet threshold Ali Double Z is an elegant and secure way to join a carpet to another carpet in a doorway. Unlike carpet door bars you can buy at the DIY shops, these are made to last, will not easily scuff or dent and will look the part for years to come. Likewise suited to joining a carpet to a hard floorcovering by