Oval Double Cylinders

Oval Double Cylinders, also known as "Double Key" cylinders, are those which allow you to lock the door from both sides, using a key on either side. For example, you may have a  barrel or cylinder of this type on your front door, enabling you to lock the door from the outside when you head out of the premises; and also to lock the door from the inside whilst at home, thus keeping your home secure. These cylinders offer a high security level.