The 17th Century saw the first manufacture of locks known as "Bénardes", which could be opened by key from both sides.
Until this point, the locks had been made of iron, and were sometimes gilded with leaf.

It was under the reign of Louis XIV that the first bronze locks appeared, carved or gold-plated with mercury for decorating the rich apartments of Versailles.
In this period, the first double-knobs were used for operating spring bolts from both the interior and exterior.