This is a plier designed to maintain and fold paper pieces precisely.
I have recently discovered the papermaker website (https://papercraft-maker.com/) and the possibility it offers to turn any 3D model into a folded paper assembly. I enjoyed using it but folding the small pieces required for high resolution objects is no easy task. This plier is designed to hold onto the paper pieces along the guidelines and fold it precisely at the right place.
You will need 6 M3 10mm long screw to assemble the jaws to the plier body. Add a bit of oil on the central pivot and use a 6.5 mm screwdriver bit for assembly. The piece is design to be tight so as to prevent play in the pliers.