Use these extension ladder locks to increase the safety of your next work project. They prevent the ladder extension from sliding down while you're standing on it. The extension ladder hardware is made from aluminium, which is lightweight but strong. Aluminium is also resists rust, making this product suitable for use in all weather conditions. The silver finish matches most aluminum ladders. Each lock measures approximately 14.5 x 31.75 x 4.3 centimetres. They come with all the hardware that you need for installation. The extension ladder locks, also known as rung locks, fit into place securely, and are also easy to release when you want to collapse the ladder back down.