UMM Micro pyramid-shanked Reamer
This tool is designed to enlarge the size of a previously formed hole by a small amount, but with a high degree of accuracy, for any miniature application.
It is perfect for opening small holes in plastic, resin, and soft metals: copper, aluminum, lead, etc.
Many kits have holes that are started part-way inside which the modeler must punch through. This reamer is perfect for cleaning and sizing the outside surface once the hole is punched.
Also, it can enlarge existing holes in gun barrels and for applying Rivets, Screws-( Aircraft Fasteners Screws).
Maximum Diameter is 3.5mm