An eye bolt is a screw with a loop on one end and threads on the other end. Eye bolts are commonly used to attach cables to objects, for instance attaching a string to the back of a painting to allow the painting to hang from a nail on a wall.
Machine screw threading
Machinery eye bolts are fully threaded and usually have a collar, which makes them suitable for use with angular loads up to 45°. Eye bolts without a shoulder should not be used for angular loads.
Wood screw threading
Wire eye lags (also referred to as screw thread eye bolts, eye screws, or turned/bent eye lags) have a wood screw thread for use in wood or lag anchors. Like wire eye bolts, wire eye lags are intended for light duty applications and should not be used for angular loads.