This is a small handle designed to hold a thumbtack, used to clean Up! cellboard. The Up! 3D printers from PP3DP use a perforated cellboard for their build plate. The system seems to work pretty well, the molten filament flows into the perforations, securing the raft and your printed object. The problem is poking the left over plastic out of these tiny holes. A thumb tack is a good size, but is too small to hold for any length of time. This makes that task easier. Made in Autodesk 123d Design. The thumbtacks that I use have a 7mm top end. It took a bit of pressure to get it pressed into the handle.