Simple CNC table clamps for M8 screws

Simple clamps for fixing the workpiece to the router table with M8 screws. For most use cases this simple design is enough for me.

The clamps are 3 centimeters wide and 12.5 and 16 centimeters long. I usually mill the clamps from 15 or 15 mm birch plywood, but of course all kinds of other materials can also be used.