Case back with thread so that is can be screwed on to the watch case.

a secure earring mechanism accompanying a threaded post

Style of earring post where the post is threaded and the back resembles a nut.

A highly secure earring fastening system whereby a nut screws onto a threaded earring post.

A screw back is an earring backing that screws onto a threaded earring post; usually used with diamond stud earrings for added protection against loss.

An earrings backing that screws onto a threaded earrings post, usually sued with diamond stud earrings for added protection against loss.

A vise-like clamp that holds a non-pierced earring on the ear by a screw that can be tightened against the earlobe.

A vice-like clamp that holds a non-pierced earring in place with a screw that can be tightened against the earlobe

A type of earring attachment for non- pierced ears where the earring is tightened against the earlobe by means of a screw with a flat padded end.