A cufflink is a decorative fastener worn by men or women to fasten the two sides of the cuff on a dress shirt or blouse. Cufflinks designed only for use with link cuffs, which have buttonholes on both sides but no buttons. These may be either single or double-length cuffs, and may be worn either kissing, with the ends pinched together, or barrel-style, with one end overlapping the other. Kissing cuffs are usually preferred. Cufflink designs vary widely. The simplest design consists of a short post or chain connecting two disc-shaped parts. The part positioned on the most visible side is usually larger; a variety of designs can connect the smaller piece. It may be small enough to fit through the buttonhole as a button would separate and attached from the other side. It may have a portion that swivels on the central post, aligning with the post while the link threaded through the buttonhole and swiveling into a position at right angles to the post when worn.