These are printable brackets that hold knucklebones or begleri. There is a left end and a right end piece, as well as a center piece that can be printed as many times as needed to expand the number of knucklebones it can hold.

These are meant to be screwed into something with two M2.5x8mm tapered-head screws.

I printed a bunch, screwed them to a flat piece of wood, and then secured the wood backing to a piece of furniture with two larger screws. However, if you don't mind having a lot of holes in it, you can just mount these directly to something.

The pieces fit together like jigsaw puzzle pieces. This just makes it a little easier to align them when screwing them in.