Eyebolts are used to attach an eye to a structure, through which rope, cable or shackles can be secured. A common use is to create a lifting eye so that a crane can be attached to machinery, with special purpose lifting eyes rated for their safe working load.
A hook-and-eye closure is a simple and secure method of fastening garments together. It consists of a metal hook, commonly wire bent to shape, and an eye (or "eyelet") of the same material into which the hook fits.