Eyelets, also known as Bolt Eyes, are used under the head or nut of a bolt;All are compatible with the strength of the bolts used with them;Straight thimble eyelets are used for span guys while angle thimble eyelets are used for down guys;Standard eyelets are used for deadending;Standard eyelets and straight thimble eyelets have a slotted hole for ease in inserting the bolt