This connector was the original equipment part when the complete mast light package (anchor, steaming and deck lights) was ordered as a factory option in the mid 80's and later. It remains in use today.
We've had requests for a metal version and unfortunately, the four pin brass deck connector uses a different mounting hole pattern.
Our deck connectors always come as a set which includes both the deck and mast half of the connector.
The screws used in this fitting are both tiny and brass. Brass is used to make a good electrical connection to the conductor. But brass is also soft.
If you use an old, worn screwdriver or one of the wrong size, you will damage the head of the screw and be unable to remove it. In addition, if you over-tighten a screw you will break it off. Neither is the result of a factory defect. The manufacturer will not replace the part for you under their warrantee. If you damage a screw in this way, your only recourse is to purchase another complete connector.