This is a handle insert for the Euroboxes from Bauhaus with the dimensions 40x30. These handles have a grid to prevent animals from getting into the box, but the box is not closed so air can still get in. For the installation you have to drill two holes in the box and screw the handle with two M5 screws.
Eurobox - https://www.bauhaus.at/kunststoffboxen/bauhaus-eurobehaelter/p/10753175
Wrench for screws - https://www.thingiverse.com/thing:6347795
Eurobox-Handle.stl | 1.4MB |