The Eagle hangars were decorated with various small models, including steps. These steps are about 8 inches/ 20cm long.
These photos are from an ebay auction from June 2019, when the model sold for £875.
The model seems to be one of a couple used for hangar scenes with the 22 inch Eagle cut-outs, as shown in the above shots.
Another hangar steps model, and as it appears in the Eagle hangar. Note the Airfix Saturn V rocket nozzle under the steps.