Large PCB vise

EDIT: changes things up a bit. 3 holes one for a 1/4 x 20 nut and 1/4 inch holes. stable and able to screw down the vise.

Wanted a larger vise for my circuitry work, This works amazing as long as you have a sturdy base. Lots of weight with big boards! I printed 50% infill came out great then added some of the screws from a desktop side panel that worked great. For the bar it is a 3/8" square stock it allows a bit of wobble and is easy to re position but once its screwed down it doesn't move. The actual clamps have a dual profile for some smaller thickness boards and then the larger dual layer giants. I mounted mine on the helping hand just for show, I am currently working on a sturdy base.