【2 Installation Options】: Includes 2 metal anchors and 2 metal mounting plates without drilling. One option is for drilling (hole covers included) and the other is for non-drilling (mounting plates also included). 【High-Quality Material】: These sliding deck locks are made of high-quality zinc alloy, providing superior durability and wear resistance. 【Key Included】: Each sliding gate lock comes with 2 keys (keys are universal). These sliding deck locks come with all necessary security mounting hardware. 【Easy to Use】: The locks are easy to install and convenient to use, coming with all security mounting accessories, including stainless steel screw caps. 【Safety】: These are a type of patio window sliding door latches, designed to prevent accidental opening of the window, providing extra security for your child and the window. We suggest mounting the locks at the top and bottom for maximum security, creating a home security system.