The Prime-Line U 9819 Aluminum Sliding Window Security Lock is a set of 4 lockable window locks designed for sliding windows. Made of durable aluminum material, these silver locks are suitable for home improvement projects and offer a 1-year manufacturer warranty for peace of mind. With a compact height of 1 inch and depth of 0.5 inch, these window locks by Prime Line Products are a reliable and efficient solution for enhancing the security of your sliding windows.