This vintage gas key has a small groove on the end that would fit as a key to turn on a gas fireplace. The groove is a small square that is just under 1/2". The key could also be used as home decor to show off its ornate detailing by hanging it on a wall or with a key collection. It is 7 1/2" long and 2 1/2" wide at the keys head. It is in top-notch vintage condition, and is heavy and sturdy.