Wiktionary
eye bolt
n. (alternative form of eyebolt English)
Wikipedia
Eye bolt
An eye bolt is a bolt with a loop at one end. They are used to firmly attach a securing eye to a structure, so that ropes or cables may then be tied to it.
Usage examples of "eye bolt".
The dog was not to be seen, but the rope, tied to the eye bolt on the flat roof, trailed over the edge and disappeared across the straw-covered threshold.