These attractive vintage cuff links are circa 1970s/80s. They are fashioned from gold colored metal and three colored inlaid agate. They are stamped "Hayward" on the back. The front oval measures 3/4 X 1/2 inch and they are 1/2 inch long when the back piece is "locked" as it would be once through the shirt cuff opening. I do not know the cuff link terminology so please excuse this, the back piece which goes through the cuff opening bends up so that once it is through you can clamp it against the cuff and it holds the cuff together.In great condition.