High Quality Material: Jammer door stopper is made of high quality aluminum alloy, which is durable and rustproof. Provide you with stable and long-term security protection. Convenient: Suitable for UPVC/PVC windows and doors. It is easy to install and matches most styles of furniture. 4 anti-theft locks to meet your different needs. Easy to use: The handle of the window security lock is ergonomically designed, not easy to scratch your hand, the shape design T allows the window to be opened and closed by rotating the lock arm Anti-wear pad: The lock window has an anti-wear pad which can reduce the friction between window security arm and windows to reduce scratches. Rest assured. Easy to install: The aluminum alloy window security lock has two screw holes, you mount it by placing the lock in the fixed position of the window, insert the screws into screw holes and tighten, assembly is ready. Effectively protect your privacy and security. Number of pieces delivered: 4 Color: Black Size: 66*60*20mm