Ideal Application - This patio door latch is ideal for both right and left-handed patio doors 1 inch to 1 – 1/4 inch thick and comes with a keyed lock for additional security . The inside latch features “No Lock Out” technology to prevent being locked out . Durable construction ensures reliable everyday use on your sliding patio door . Ready To Install - All installation hardware is included and easily installs in 3-5/16 inch center to center hole spacing . All installation hardware included . Clean Subtle Look - High-quality finish allows it to blend in perfectly with your door and frame. Smooth locking mechanism provides effortless operation and secure engagement every time. Universal compatibility fits most standard sliding patio door configurations for versatile installation