Spacers (2 pieces), for flush installation (trimless) of a SUPERSYSTEM integral system in a cavity ceiling, enable continuous built-in installation of a SUPERSYSTEM INTEGRAL system consisting of Zumtobel 3-phase/L3+DALI power tracks and SUPERSYSTEM INTEGRAL light/blind inserts, for fastening a Zumtobel power track system offset in depth, installation joints with plaster frames (trimless) must be provided on site for the SUPERSYSTEM INTEGRAL system, centering of the Zumtobel 3-phase/L3+DALI power track using installation aid (included in delivery, material: die-cast aluminum, black, distance between the holders maximum every 1000mm, designed for ceiling thicknesses of 12.5mm, dimensions: 51x145x87 mm, weight: 0.35 kg, note: observe ceiling substructure in accordance with DIN EN 13964!