A hull lifting eye is a metallic loop that is installed within the boat's hull for the purpose of easily lifting or moving it. However, there are a number of synonyms that can be used to describe this essential nautical accessory. These include terms such as eye bolt, lifting ring, screw eye, lift eye, eye nut, and even shackle. Regardless of the term used to describe this useful tool, it remains a critical component for a variety of marine operations, including the transport and repair of vessels of all sizes. The right hull lifting eye can make all the difference in the success and safety of any such operation at sea.