Post and Clutch on a Stud Earring.

A post is a short length of straight wire that is affixed perpendicular to the back of an earring and passes through the earlobe. The earring is secured by the use of a clutch that slides on or is threaded onto the post or an earclip that allows the post to pass through.

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Post and Clutch on a Threaded Stud Earring.

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Post and Clip on the Reverse of a Clip Earring.