Padeye

An Aviation Machinist's Mate connecting tiedown chains to padeyes on the flight deck of the aircraft carrier USS Dwight D. Eisenhower (CVN 69)

A padeye is a device often found on boats or ships that a line runs through or provides an attachment point. It is a kind of fairlead and often is bolted or welded to the deck or hull.

It is also used in oil and gas projects to assist in the purpose of lifting.