This Black PVD Batman titanium threadless top is such a fun piece to work with! This sign was used to call Batman to help the police department in comic books! Fits most threadless posts. It is made from black PVD on ASTM F-136 titanium. It has a 25G titanium pin, that measures about 4.7mm in length. Top piece measures about 6mm x 3mm. Sold individually (top piece only).