These City Builder corner post V fillers are made to fill in the emty space where the walls slots in to the corner post and clean up the look of your DF City Builder. I only made wood for now. it make the look like wood beams in same

It will require drilling holes in your corner post. Using the jig to center the hole at the right hight, a 1/8 inch or 3mm/3.5mm hole will be a tight fit for the 3.5 mm peg. I would sugest test it out on one first defor drilling a bunch of holes.