【2 Installation Methods】: Includes 2 metal anchors and 2 drill-free metal mounting plates. One method is drill installation (retaining caps included) and the other is drill-free installation (mounting plates also included). 【High-Quality Material】: The sliding door locks are made of high-quality zinc alloy, offering superior durability and wear resistance. 【Key Installation】: Each sliding door lock comes with 2 keys (keys are universal). These sliding door locks come with all necessary security mounting hardware. 【Easy to Use】: The locks are easy to install and convenient to use. They come with all necessary security mounting hardware, including stainless steel screw caps. 【Safety】: This is a type of sliding door latch for patio windows. To prevent the window from opening accidentally and to ensure greater safety for your child and the window, we suggest installing locks at the top and bottom for maximum security. This is a home security system.