Which component is used to lead mooring lines smoothly?

The component utilized to lead mooring lines smoothly is a chock. Chocks are typically mounted on the deck of a ship and are designed to guide the mooring lines and prevent them from chafing against the ship's surfaces. They are shaped to allow lines to be easily led in various directions, effectively channeling the mooring lines while maintaining a secure connection. This helps in the safe maneuvering and securing of the vessel during docking and mooring operations.

Considering the other options, bollards are strong, vertical posts used mainly for securing mooring lines but do not have the guiding structure that chocks possess. Cleats provide a reliable means to secure lines but are not specifically designed for guiding or leading them. Bitts are similar to bollards in function but are also typically used for securing lines rather than guiding them. Chocks stand out for their capability to lead lines smoothly while minimizing wear and ensuring effective mooring procedures.