Reversable Hold-Down Clamp - multiple sizes

I decided to make some different lengths of this design to better match the hole-spacing on our Shapeoko CNC router. We have 3 or 4 inch spacing between our holes, so the big ones are really helpful. Having other sizes seemed useful as well.

Tip: The long ones do have a lot of flex to them, so I would advise using them sparingly. They could be designed to be a little thicker to make up for this.