Premier Z13 - Antique BrassThe Premier Trims Z13 door thresholds transition from thick carpet to tiles & wood Buy now over 10 different finishes The Premier Trims Z13 door thresholds are an elegant and secure way to join particularly deep pile carpet (up to 13mm thick when compressed) to a hard floor surface such as tiles, stone, thick LVT or wood. If your carpet is a standard thickness, around 8 10mm, we suggest you consider the Premier Z9 instead. The two base floors i. e.