You are looking at an Aluminum Single Cross Dock Cleat. This was salvaged from a once working vessel that was being torn apart for scrapes.
Dock Cleats are used to secure vessels to docks. Ideally, all cleats should be sturdy, resistant to any corrosion and should be installed on the dock frame rather the just the deck itself.
You will see some surface wear on it but overall in good condition.
This cleat is still perfect for its original purpose, securing vessels, but it would also make great coastal or nautical decoration.
Cross Bar: 5″
Base: 4.5″ wide by 4.5″ long
Weight: 1.7 lbs.