General description 4 T-shaped PVC security lock windows made from solid zinc alloy die-cast construction. These locks feature a durable white powder coat finish, providing added safety and ease of use with a single click to turn on and off. Sash protectors are designed to enhance security for your uPVC windows and doors. Technical specifications Length: 63.5 mm Center hole distance: 44 mm Installation Easy to install: simply rotate the interference arm to lock or release the chassis.