FEATURES: The sash window blocker is effectively a heavy duty door blocker and sash window lock. This is a must-have accessory for your home to add security and prevent intruders from accessing your front door, other exterior doors or PVC windows. This is possible by preventing the lever of the door or window sash.CHILD SAFETY LOCKS: These door and window locks protect curious children from unlocking the sash blocker and opening the window or door on their own, helping to keep your child safe when they are out of your line of sight.SECURE LOCKED ARM: The lock with guillotine has a durable locking arm that does not move from its position once it is locked in place with the key (i.e. it acts like a door lock with key). This ensures complete security, providing additional resistance against forced entry.FINISH: These sash blockers are made of high quality die-cast zinc for added strength and durability. They are finished in pure white to match the most popular color of PVC frames. The slim design offers a clean look that won't take away from your home decor. Please refer to the images for detailed product dimensions.ACCESSORIES: All fixings are supplied including keys, fixing screws and plastic hole covers. They also come with 1mm and 2mm packers to ensure a secure fit. PVC door and window blockers are simple to use and easy to install. You don't need to be a DIY expert and only need basic tools to complete the installation.