Car Assembly: TOP Construction / Finish: NATURAL MATT Door Assembly: INLAY Brand: Ducasse Marketing Copy: U21 smooth aluminum upper track is designed for sliding doors 7/8 in to 1 1/2 in (22 mm to 38 mm) thick, whit dn80 system. Material: Aluminum Rail Thickness: 1.8 mm (5/64") System Movement: LINEAR Sell Without Stock: No