I have a small collection of jaws for the Technatool Nova series building up, and this is a way to keep them orderly.
The screw in the middle prints in different sizes so you don't have a tall screw sticking out of your 50mm bowl jaws, for example.
Note that I printed the screws with a -0.25 layer expansion to help the threads fit together. YMMV.
The author marked this model as their own original creation.