【2 Installation Ways】: With 2 metal anchors and 2 metal mounting plates without punching, one is punching installation (hole caps are provided) and the other is non-punching installation (fixed plates are also provided) 【High Quality Material】: The sliding patio locks are made of high quality zinc alloy. Better preservation and wear resistance. 【With Key】: Each sliding door lock comes with 2 keys. (The keys are universal). These sliding patio locks come with all safety fixing accessories. 【Easy to Use】: The locks are easy to install and convenient to use, come with all safety fixing accessories, including stainless steel screw caps. 【Safety】: This is a kind of patio window sliding door latches, to prevent accidental window opening, more safety for your child and the window, we suggest you mount the locks on the top and bottom for maximum safety, home security system.