It is a free-hanging, cap-style connector — the nickel-plated brass body and gold-plated brass pin are standard for a BNC that needs a clean RF signal path at 75 Ohms. The polyethylene dielectric maintains the impedance through the interface. This is a single-piece plug, not a field-installable crimp kit; the lanyard on the body gives a pull point for tethered or quick-disconnect applications where the connector might need to be retrieved from a tight panel area.
The lanyard variant is less common than the standard BNC plug, so stock in the broker channel may be thinner than for the base 221629-1.
This is a 75 Ohm BNC plug — not a 50 Ohm version. The impedance is set by the dielectric geometry and material, so using this connector on 50 Ohm cable will create a mismatch at the interface. For a 50 Ohm BNC requirement, a different part number from the same family is needed. The lanyard feature is a molded-in pull loop on the backshell, not a field-attachable accessory.