Accurately find the center of round and cylinder bars and stocks. Can also be used on square stock. Edged blade helps to accurately mark the center of a part. For good precision, use a razor blade or X-Acto knife to score a fine line off the knife edge. Great for both metal and woodworkers. 

Along with this square, I have modeled a Sliding T Bevel Square that is an essential tool for laying out, checking and reproducing inside and outside angles.

https://www.printables.com/model/987069-sliding-t-bevel-false-square

A small vice that has multiple ways to secure objects, using spool pins or jaws. Versions with and without a base plate.

https://www.printables.com/model/1212482-small-universal-clamp-bench-or-portable-vise