This is for lengthening the Märklin roller test stand by 40 cm / 15-3/4". This can also be used by itself as a presentation base. This extension is ideal for models of the class 03, class 41, and the Mikado. The superstructure is made of black oxidized aluminum shapes. C Track with removable end sections is included along with and adapter track section for lengthening a roller test stand. Dimensions 400 x 42 x 30 mm / 15-3/4" x 1-5/8" x 1-3/16".