That looks like a Camloc that has the end broken off. The 4002 series Camloc looks similar. Probably a 40S- something cad plated. If there's another one next to it, you could measure the length and figure out what dash # to order.
SPB - thanks! You are right and makes sense because my father maintained a fleet of Piper Aztecs and why he would have those fasteners - holy crappers $80 bucks each!!!
Yes, they screw into a socket and are a nice product, just expensive.