These are clips used to space and level tile during tile installation. They are placed between the tils, and locked in place with a wedge. After the mortar sets, the wedges can be broken off. They are similar in Concept to something like the DEP Tile Lash System, but the clips are redesigned for easy 3D printing. You can print them for an entire job, or you can print just a few in case you ran a little short and don't want to buy an entire bag of 100 clips.