I've designed a PCB vise

For the assy you will need also:

2x 6mm rods - as long as you want/need

2x M5 screws for the flexible jaw

2 x springs with ID 6 mm

1x M6 screw for the fixing of the mobile jaw

1x M6 wing nut

4 x M3 threaded inserts

4X M3 screws for the replaceable jaws