This product is a lot of four antique iron oar locks, each measuring 5.5 inches in length. They are designed in a U shape with a base hole, making them perfect for securely locking oars in place on a rowboat. Made of metal, these oar locks are durable and will provide a secure hold for your oars while out on the water. One has holes on the sides at the top, the rest don’t.
eBay