Looking for a 0,25m vertical piece

Dear builders, I'm looking for help. Is there a way to snap something and produce a 0,25m vertical distance?

Horizontally, we have the basic door, that serves as both 0,5m and 0,25m snap point. Vertically I only know of the corewood beam that offers a 0,5m snap point distance, but no 0,25m one.....

Is there a piece that can be used for this? No mods, just vanilla.