Features:

The high quality shiny cover is made of polished stainless steel,it is UV and weather resistant.
The wire cover is used for sealing and splash proof openings of wires,hoses etc. Perfect for transducer wire cover,cable cover,you can cover a thru-hole for your hose, you can also use them as an outside vent for your compost toiltet.
Used to cover the hole in transom for the transducer cable,or cover the holes in the bow of the boat that drain the fish box. It keeps water from pouring in if you are in rough water even though it likely wouldn't go too far up the drain, but having them on makes sure of that.