Black rectangular strut backs - 18x24 cm
They are black MDF rectangular backs.
Thickness 2,5 mm
The strut is adjustable to fit the width of the stand with which the photo frame is made. The maximum projection of the support is 20 mm if the frame is placed on the short side and 15 mm if it is placed on the long side.
The support needs to slide along the two special lanes to adjust the projection. Scrolling deliberately requires a certain degree of manual effort to ensure that after adjustment, the support does not move from its position.